Digital Input / Output - Measurement Computing PCI-CTR10 User Manual

PCI-CTR10 User's Guide
Parameter
X2 clock frequency
scaler
High pulse width
(clock input)
Low pulse width
(clock input)
Gate width high
Gate width low
Input low voltage
Input high voltage
Output low voltage @
IIl = 3.2 mA
Output high voltage @
IIH = -200 µA
Crystal oscillator
frequency
Frequency accuracy
Data transfer
Power-up / reset state

Digital input / output

Digital type
Number of I/O
Configuration, per connector
Input high voltage
Input low voltage
Output high voltage
Output low voltage
Data transfer
Power-up / reset state
Din Strobe
Din Strobe pulse width high/low
Data setup to Din Strobe
Data hold from Din Strobe
Conditions
BCD scaling (X2 divided by 10, 100, 1000 or 10000) or Binary scaling (X2 divided by 16,
256, 4096 or 65536)
70 ns min
70 ns min
145 ns min
145 ns min
-0.5 V min, 0.8 V max
2.2 V min, Vcc max
0.4 V max
2.4 V min
10 MHz
50 ppm
Programmed I/O, interrupt
CTRnOUT_x: low impedance
OSCOUT_x: enabled
Table 2. Digital I/O specifications
Discrete, 5V/TTL compatible
Output:74ACT273
Input: 74LS373
8 input, 8 output per 37-pin D connector
1 bank of 8 as output, 1 bank of 8 as strobed input
2.0 V min, 7.0 V absolute max
0.8 V max, –0.5 V absolute min
3.94 volts min @ -24 mA (Vcc = 4.5 V)
0.36 volts max @ 24 mA (Vcc = 4.5 V)
Programmed I/O
Digital outputs power on and Reset to TTL low
Active low latch enable input, internally pulled high through 10 Kohm resistor
15 nS min
5 nS min
20 nS min
4-2
Specifications