Unit 1 Session - 3 TTL Parameters
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- Melvin Holt
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1 Objectives Understanding various TTL Parameters Floating Inputs Worst-Case Input Voltages & Output Voltages Profiles and Windows Compatibility Sourcing and Sinking Noise Immunity Standard Loading and Loading Rules Introduction The TTL series devices are guaranteed to work reliably over a temperature range of 0 to 70 C and over a supply voltage of 4.75 to 5.25 Volts. We need to know the worst case values for the different parameters like input current, output voltage, and so on. Floating Inputs Unit 1 Session - 3 TTL Parameters If TTL input is floating (unconnected) there is no emitter current. If TTL input is connected to logic 1 (+ 5 V), obviously, there is no emitter current. Hence a floating TTL input is equivalent to a logic 1. Disadvantage of Floating Inputs Floating input acts as a small antenna It will pick up stray electromagnetic noise voltages Noise pickup can be large enough to cause erratic operation of logic circuits Page 1
2 Solution We connect unused TTL inputs to supply voltage. We have direct connection to supply voltage in case of 74S and 74LS series and high input through a pull-up resistor for 74, 74L, 74H seriess as shown below. Worst-Case Input Voltages Consider a TTL inverter. Ideally, the low input state V IL = 0 V and the high input state V IH = 5 V. V IL, max = 0.8 V (If the input voltage is greater than 0.8 V, the output state is unpredictable). V IH, min = 2 V (If the input voltage is less than 2 V, the output state is again unpredictable). Ideally, the low output state V OL = 0 V and the high output state V OH = 5 V. V OL, max = 0.4 V and V OH, min = 2.4 V. TTL Input Profile Page 2
3 Compatibility The TTL devices are compatible. The low and high output windows fit inside the low and high input windows, as shown in the figure below. Output of any TTL device is suitable for driving the input of another TTL device. Sinking Current When standard TTL output is low, transistor Q4 acts as a current sink and I IL, max = ma (see figure below). Page 3
4 Sourcing Current When the standard TTL output is high a reverse emitter current flows, transistor Q3 acts as a source and I IH, max = 40 µa (see figure below). Noise Immunity The worst-case low values are: V OL, max = 0.4 V driver output V IL, max = 0.8 V load input The worst-case high values are: V OH, min = 2.4 V driver output V IH, min = 2 V load input Page 4
5 There is a difference of 0.4 V between the driver output voltages and required load input voltages. This difference is called noise immunity. The noise immunity values Δ0 and Δ1 corresponding to low level and high level are calculated as shown below: Noise Immunity Δ0 V IL, max - V OL, max = 0.4 V Noise Immunity Δ1 V OH, min - V IH, min = 0.4 V Standard Loading A TTL device can source current (high output) or sink current (low output) series device can sink up to 16 ma i. e. I OL, max = 16 ma. It can source up to 400 µa i. e. I OH, max = µa. The worst-case TTL input currents are: I IL, max = ma and I IH, max = 40 µa. Output currents = 10 x Input currents. So we can connect up to 10 TTL inputs to any TTL output and the fanout = 10. Low-state Fanout Page 5
6 High-state Fanout Standard TTL Output-Input Profile Low-power TTL Output-Input Profile Page 6
7 Schottky TTL Output-Input Profile Low-Power Schottky TTL Output-Input Profile Page 7
8 Fanouts of TTL Types TTL Driver TTL Load 74 74H 74L 74S 74LS H L S LS Questions 1. Discuss the importance of the various TTL parameters. 2. What is the fanout of a 74S00 device when it drives low-power TTL load? Page 8
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