Measurement-computing PCI-CTR10 Manual do Utilizador descarregar pdf (Página 15)

PCI-CTR10 User's Guide Specifications

Parameter Conditions

X2 clock frequency

scaler

BCD scaling (X2 divided by 10, 100, 1000 or 10000) or Binary scaling (X2 divided by 16,

256, 4096 or 65536)

High pulse width

(clock input)

70 ns min

Low pulse width

(clock input)

70 ns min

Gate width high 145 ns min

Gate width low 145 ns min

Input low voltage -0.5 V min, 0.8 V max

Input high voltage 2.2 V min, Vcc max

Output low voltage @

IIl = 3.2 mA

0.4 V max

Output high voltage @

IIH = -200 µA

2.4 V min

Crystal oscillator

frequency

10 MHz

Frequency accuracy 50 ppm

Data transfer Programmed I/O, interrupt

Power-up / reset state CTRnOUT_x: low impedance

OSCOUT_x: enabled

Digital input / output

Table 2. Digital I/O specifications

Discrete, 5V/TTL compatible

Output:74ACT273

Digital type

Input: 74LS373

Number of I/O 8 input, 8 output per 37-pin D connector

Configuration, per connector 1 bank of 8 as output, 1 bank of 8 as strobed input

Input high voltage 2.0 V min, 7.0 V absolute max

Input low voltage 0.8 V max, –0.5 V absolute min

Output high voltage 3.94 volts min @ -24 mA (Vcc = 4.5 V)

Output low voltage 0.36 volts max @ 24 mA (Vcc = 4.5 V)

Data transfer Programmed I/O

Power-up / reset state Digital outputs power on and Reset to TTL low

Din Strobe Active low latch enable input, internally pulled high through 10 Kohm resistor

Din Strobe pulse width high/low 15 nS min

Data setup to Din Strobe 5 nS min

Data hold from Din Strobe 20 nS min

4-2

1 2 ... 10 11 12 13 14 15 16 17 18 19

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