ic-vx 3-CHANNEL DIFFERENTIAL LINE DRIVER

Transcription

1 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 1/11 FEATURES 6 current-limited and short-circuit-proof push-pull driver stages in complementary configuration Guaranteed driver current can be set to or 100 Outputs compatible to TTL at low load current Integrated free-wheeling diodes Short switching times and high slew rate Schmitt trigger inputs with integrated pull-up current sources and clamping diodes Inputs compatible to TTL and CMOS levels Operating points can be shifted by separate feed of inputs On-chip thermal shutdown with hysteresis Extended temperature range of EC APPLICATIONS Line driver for 4 control engineering PACKAGES SO16W TSSOP0 thermal pad BLOCK DIAGRAM CC 6 T 16 B1 A NA1 14 CHAN1 A 1 E NA 11 CHAN A 10 7 NA 9 EE CHAN THERMAL SHUTDOWN BIAS SUB ic-x SO16W B ic-haus GmbH Tel Integrated Circuits Fax Am Kuemmerling 18, D-5594 Bodenheim

2 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page /11 DESCRIPTION The device ic-x is a monolithic, -channel line driver with complementary outputs for 4 applications. The Schmitt trigger inputs contain pull-up current sources and run on separate operating voltages. Their reference potential can be adjusted in the range of the output stage supply voltage to adapt the input threshold voltage for various applications. The guaranteed driver current can be set to ( pin open) or 100 ( pin at SUB). At low load the drivers are TTL-compatible due to reduced saturation voltages. The output stages are current-limited and, due to the shutdown at overtemperature, they are also protected against thermal destruction. Due to the hysteresis of the overtemperature shutdown, the driver outputs switch on and off as a function of the ic power loss until the overload ceases. For driver current the short-circuit strength is guaranteed directly by the ic. For 100 driver current in 4 applications this is guaranteed by S series resistors. Free-wheeling diodes at the outputs protect the ic against echoes of mismatched lines. The inputs and outputs of the channels have diodes for protection against destruction by ESD. PACKAGES SO16W, TSSOP0 to JEDEC Standard PIN CONFIGURATION SO16W PIN FUNCTIONS (top view) Name Function n.c. E CC EE T B n.c n.c. B A1 NA1 A SUB NA A NA n.c. Input Channel 1 E Input Channel CC Inputs Supply oltage (+5) EE Reference oltage for Inputs (0) Programming Input for Driver Current (open, to SUB 100) T Bias Supply oltage Input Channel B Drivers Supply oltage NA Inverting Output Channel A Output Channel NA Inverting Output Channel SUB Ground, Substrate PIN CONFIGURATION TSSOP0tp 4.4mm A Output Channel (top view) NA1 Inverting Output Channel 1 A1 Output Channel 1 B Drivers Supply oltage Pins B1 and B must both be connected when the 100 driver current is set. To enhance heat removal, the TSSOP0 package offers a large area pad to be soldered (a connection is only permitted to SUB).

3 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page /11 ABSOLUTE MAXIMUM RATINGS alues beyond which damage may occur; device operation is not guaranteed. Item Symbol Parameter Conditions Fig. Unit Min. Max. G001 CC-EE Supply oltage for Schmitt Trigger 0 1 Inputs G00 B1, B Positive Supply oltage for Output Drivers 0 G00 T Bias Supply oltage 0 G004 () oltage at 0 G005 I(A,NA) Output Current in A1.., NA G006 I(E) Current in E001 d() ESD Susceptibility, all Inputs and MIL-STD-88, Method 15, HBM 1 k Outputs 100pF discharged through 1.5kS TG1 Tj Junction Temperature C TG Ts Storage Temperature C THERMAL DATA Operating Conditions: B= 4.5.., T= CC= 5 ±10% Item Symbol Parameter Conditions Fig. Unit Min. Typ. Max. T1 Ta Operating Ambient Temperature Range C (extended range to -40 C on request) T Rthja SO16W Thermal Resistance Junction to Ambient T Rthja TSSOP0 Thermal Resistance Junction to Ambient surface mounted with ca. cm² heat sink at leads (see Demo Board) surface mounted, thermal pad soldered to ca. cm² heat sink K/W 40 K/W All voltages are referenced to ground unless otherwise noted. All currents into the device pins are positive; all currents out of the device pins are negative.

4 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 4/11 ELECTRICAL CHARACTERISTICS Operating Conditions: EE= SUB= 0, B= 4.5.., T= CC= 5 ±10%, Tj= C, unless otherwise noted Item Symbol Parameter Conditions Tj Fig. Unit C Min. Typ. Max. Total Device 001 CC- EE Permissible Supply oltage Range for Inputs CC Permis. Supply oltage CC 4.5 B 00 EE Permis. Supply oltage EE 0 B I(CC) Supply Current in CC T Permis. Bias Supply oltage T 4.5 B 006 I(T) Supply Current in T at SUB I(T) Supply Current in T open 008 B1, B Permis. Drivers Supply oltage at B1 and B I(B) Supply Current in B at SUB, I(A1.., NA1..)= I(B) Supply Current in B open, I(A1.., NA1..)= Driver Outputs A1.., NA s()hi Saturation oltage hi (driver capability 100) 10 s()lo Saturation oltage lo (driver capability 100) 10 Isc()hi Short-Circuit Current hi (driver capability 100) 104 Isc()lo Short-Circuit Current lo (driver capability 100) 105 èsr()è Slew-Rate hi:lo (driver capability 100) to SUB, B1 and B connected, s(a)hi= B-(A,NA); I(A,NA)= -10 I(A,NA)= - I(A,NA)= -100 to SUB, B1 and B connected; I(A,NA)= 10 I(A,NA)= I(A,NA)= 100 to SUB, B1 and B connected, (A,NA)= 0 to SUB, B1 and B connected, (A,NA)= B to SUB, B1 and B connected, RL(A,NA)= 750S, CL(A,NA)= 100pF /µs

5 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 5/11 ELECTRICAL CHARACTERISTICS Operating Conditions: EE= SUB= 0, B= 4.5.., T= CC= 5 ±10%, Tj= C, unless otherwise noted Item Symbol Parameter Conditions Tj Fig. Unit C Min. Typ. Max. Driver Outputs A1.., NA1.. (continued) 106 s()hi Saturation oltage hi (driver capability ) 107 s()lo Saturation oltage lo (driver capability ) 108 Isc()hi Short-Circuit Current hi (driver capability ) 109 Isc()lo Short-Circuit Current lo (driver capability ) 110 èsr()è Slew-Rate hi:lo (driver capability ) 111 s()lo Saturation oltage lo for TTL-Levels open, s()hi= B-(A,NA); I(A,NA)= - I(A,NA)= -10 I(A,NA)= - open; I(A,NA)= I(A,NA)= 10 I(A,NA)= 5, B= I(A,NA)=, B= open, (A,NA)= open, (A,NA)= B 100 open, RL(A/NA)= 750S, CL(A/NA)= 100pF /µs I(A,NA)= I0(A,NA) Tri-state Leakage Current Tj> Toff, (A,NA)= 0..B µa 11 c()hi Clamp oltage hi c(a,na)hi= (A)-B; I(A,NA)= c()lo Clamp oltage lo I(A,NA)= Inputs.. 01 t(e)hi Threshold oltage hi referred to CC-EE 45 % 0 t(e)lo Threshold oltage lo referred to CC-EE 5 % 0 t(e)hys Hysteresis 6 % 04 I(E) Input Current (E)= EE..CC µa 05 c(e)hi Clamp oltage hi c(e)hi= (E)-CC; I(E)= c(e)lo Clamp oltage lo I(E)= tp() Propagation Delay E6A, E6NA (driver capability 100) 08 )tp (A-NA) Delay Skew A vs. NA (driver capability 100) 09 tp() Propagation Delay E6A, E6NA (driver capability ) 10 )tp (A-NA) Delay Skew A vs. NA (driver capability ) 50%(E) : 50%I(A,NA); to SUB, RL(A/NA)= 750S )tp()= ètp(e-a) -tp(e-na)è; to SUB, RL(A/NA)= 750S 50%(E) : 50%I(A,NA); open, RL(A/NA)= 750S )tp()= ètp(e-a) -tp(e-na)è; open, RL(A/NA)= 750S µs µs 0.8 µs µs Thermal Shutdown, Bias 1 Toff Thermal Shutdown Threshold C Thys Thermal Shutdown Hysteresis 15 C

6 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 6/11 APPLICATIONS INFORMATION Line drivers for control engineering couple digital signals with TTL or CMOS levels via lines to 4 systems. Due to possible line short circuits, the drivers are current-limited and shut down in the event of overtemperature. The device ic-x permits the operating points of the Schmitt trigger inputs to be shifted with the supply voltages CC and EE, thus within the range of the output stage supply voltage B. The programming of the driver current to or 100 permits optimum matching on the basis of line length and required transmission rate. External series resistors must be provided for higher driver current to ensure short-circuit strength in 4 applications. Furthermore, these series resistors improve the ability of the driver to adapt to the line surge impedance.

7 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 7/11 EXAMPLE 1: Short lines Short lines of 5m, for example, are approximations of capacitive load for the ic; no adjustment of characteristic impedance is required. With each switching slope changeover losses of Pc= 1/ B I(A) per channel occur in the ic. The load capacity is reloaded with the guaranteed driver current I(A)$. These changeover losses determine the possible cut-off frequency, since the high chip power loss without cooling results in shutdown of the ic. At high capacitive load the transmission rate can also be limited by the fall and rise times wich reduce the signal strength. 4 5 A 1 CC T 6 C1 1µF B1 16 A1 15 NA1 14 C 1µF L=5m, CL=500pF PLC k CHAN1 A 1 B E NA 11 k CHAN A 10 Z 7 NA 9 k CHAN EE 4 THERMAL SHUTDOWN BIAS 5 SUB 1 ic-x B 8 Fig. 1: Balanced data transmission at low capacitive load, pin open: I(A)$ As a typical application, Fig. 1 shows the transmission of the output signals of an incremental rotary encoder (track A, track B, index pulse Z) to a programmable control (PLC). The maximum signal frequency which is limited by the power loss can be estimated by standardizing the limiting values of the example for short lines: f max. 00kHz 500pF 4 CL B 41K&T a 70K 75K/W R thja channels (1.1) If the slew-rate is the limiting factor, the following applies for the maximum signal frequency (saturation voltages neglected): f max. 4 B (CL%1nF) (1.) CL = Capacitive load at output A to output NA B = Supply voltage T a = Ambient temperature R thja = Thermal resistance chip/board/ambient (R thja = R thjb + R thba )

8 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 8/11 EXAMPLE : Long lines Lines which are relatively long, for example 100m, require a higher driver current and an adapter. An appropriate S series resistor at the driver output ensures short-circuit strength and a suitable division of the power loss to resistor and ic. The pin at SUB selects the high driver current of 100. In this case the driver supply must be channeled via B1 and B. 4 5 CC T 6 C1 1µF B1 16 A1 15 C 1µF PLC A 1 k NA1 14 CHAN1 L=100m, CB=100pF/m A 1 B E k NA 11 CHAN A 10 Z 7 k NA 9 CHAN EE 4 THERMAL SHUTDOWN BIAS ic-x 5 SUB 1 B 8 Fig. : Balanced data transmission at high capacitive load, to SUB: I(A)$ 100 The maximum signal frequency which is restricted by the power loss can be estimated by standardizing to the limiting values of the example for long lines: f max. 0kHz 100pF/m 100m 4 CB L B 41K&T a 70K 75K/W R thja channels (.1) If the slew rate is the limiting factor, the following applies for the maximum signal frequency (saturation voltages neglected): f max B (C L %1nF) (.) CB = Line capacitance per meter L = Length of the line C L = Effective capacitance at output A to NA B = Supply voltage T a = Ambient temperature R thja = Thermal resistance chip/board/ambient (R thja = R thjb + R thba ) The current limitation of the driver stages extends to about 0 in the 100 setting. By that, until the activation of the thermal shutdown, the maximum power dissipation for each S series resistance and for the ic at 4 can be estimated. Max. power loss in the resistor: Pmax R = I² R = (0)² S =.7W Max. power loss in the ic pro channel: Pmax IC = (B - I(A) R) I(A) = 4.5W

9 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 9/11 The average power loss in the ic and the resistors declines when the thermal shutdown interrupts the driver outputs due to abnormal rising chip temperature. The installed series resistances should suit for the estimated power dissipation to avoid overload due to permanent line short-circuits. If the drivers are operated at low power supply, e.g. B= 1 instead of B= 4, the power loss account for the ic declines and the thermal shutdown is initially delayed or is not activated at all. If B is under 0, lower resistors are permitted (>10S) without endangering the short-circuit strength of the ic. Consequently, the ic s temperature monitoring is reactivated and even 1/W resistors are not overloaded. EXAMPLE : Data transmission in the case of activation with TTL/CMOS signals In the case of activation with TTL/CMOS logic, the device can be operated with the 5 logic supply to CC and T. The pins EE and SUB must be connected to the logic ground. The 4 supply voltage must be applied to B1 or B (Fig. ). Figure 4 shows an alternative application with common positive supplies for logic and driver. Ground, respectively the reference potential EE for the inputs, is generated by using a negative voltage regulator. This wiring increases the ic power dissipation due to the higher bias supply voltage at T. Fig. : EE = SUB Fig. 4: EE > SUB In both examples the operating points of the Schmitt trigger inputs.. are compatible with TTL and CMOS levels. Depending on the line length, the driver current may be selected to with = open or to 100 with = SUB. In case of the 100 driver current the final stages must be supplied via B1 and B.

10 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 10/11 DEMO BOARD The device ic-x with SO16W package is equipped with a Demo Board for test purposes. The following figures show the wiring as well as the top and bottom layout of the test PCB. T Bridge B01 Bridge B0 CC C01 1µF/40 CC T 6 B1 16 C0 1µF/40 B A1 15 R01 1 A1 L1 NA1 14 R0 CHAN1 NA1 NL1 A 1 R0 E A L E NA 11 R04 CHAN NA NL A 10 R05 7 A L NA 9 R06 CHAN NA NL EE THERMAL-SHUTDOWN BIAS SUB ic-x B EE Bridge B0 GND Fig. 6: Schematic diagram of the Demo Board Fig. 7: Demo Board (components side) Fig. 8: Demo Board (solder dip side)

11 ic-x -CHANNEL DIFFERENTIAL LINE DRIER Rev C1, Page 11/11 ORDERING INFORMATION Type Package Order designation ic-x X Demo Board SO16W TSSOP0tp 4.4mm ic-x SO16W ic-x TSSOP0 X DEMO For information about prices, terms of delivery, options for other case types, etc., please contact: ic-haus GmbH Tel Am Kuemmerling 18 Fax D-5594 Bodenheim GERMANY This specification is for a newly developed product. ic-haus therefore reserves the right to modify data without further notice. Please contact us to ascertain the current data. The data specified is intended solely for the purpose of product description and is not to be deemed guaranteed in a legal sense. Any claims for damage against us - regardless of the legal basis - are excluded unless we are guilty of premeditation or gross negligence. We do not assume any guarantee that the specified circuits or procedures are free of copyrights of third parties. Copying - even as an excerpt - is only permitted with the approval of the publisher and precise reference to source.