National Instruments 700

Chapter 3 Signal Connections

• Absolute maximum voltage input rating -0.5 to 5.0 V with respect to DGND

• MSM82C54 digital input specifications (referenced to DGND):

–V

IH input logic high voltage 2.2 V minimum

–V

IL input logic low voltage 0.8 V maximum

– Input load current ±10.0 µA maximum

• MSM82C54 digital output specifications (referenced to DGND):

–V

OH output logic high voltage 3.0 V minimum

–V

OL output logic low voltage 0.40 V maximum

–I

OH output source current, at VOH 2.5 mA maximum

–I

OL output sink current, at VOL 2.5 mA maximum

CLK VIH

VIL

VIH

VIL

tsc tpwh

tgsu tgh

tgwh

GATE

toutg

OUT VOH

VOL

tpwl

tgwl

toutc

100 ns minimum

30 ns minimum

40 ns minimum

50 ns minimum

100 ns maximum

50 ns minimum

100 ns maximumtoutg

toutc

tgwh

tgwl

tgh

tgsu

tpwl

tpwh

tsc clock period

clock high level

clock low level

gate setup time

gate hold time

gate high level

gate low level

output delay from clock

output delay from gate

50 ns minimum

Figure 3-10. General-Purpose Timing Signals

The GATE and OUT signals in Figure 3-10 are referenced to the rising edge of the CLK signal.