Description

The ACL-8454 is a general purpose timer/counter and digital I/O card for IBM PC/AT or compatibles. It used the most popular 82C54 timer/counter chip to event counting, pulse measurement, frequency measurement, and pulse generation. In addition, 8 digital outputs and up to 16 digital inputs are 7supported in this card.

In ACL-8454, default two 84C54 chips on board and up to four 84C54 can be supported. It provides at least six or at most twelve 16-bit down counter, each counter can be configured as different clock sources and gate controls by the jumper selection. In addition, two set of time pacer generation unit, which cascades two 16-bit counter for interrupt source.

An AT interrupts (IRQ3 ~ IRQ15) are supported by the ACL-8454, and both internal and external interrupt source can be selectable by using jumper settings. Up to two set of time pacer can be generated by two cascaded 16-bit counter, which can be used as internal interrupt source.

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Features

•  
• Two (Four) 8254 Programmable Interval Timer
• Default 6 counters and expandable up to 12 counters
• Multiple configurations
• Flexible clock source and gate control setting
• Internal periodic and external interrupt source
• 8-bit digital outputs and 16-bit digital inputs
• 11 IRQ level selectable (IRQ3 ~ IRQ15)
• 37-pin D-sub Type connector

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Application

- Event counter
- Frequency counter and generator
- Frequency synthesis
- Pulse width measurement
- Low level pulse generator
- Time delay
- Industrial automation
- Watch-dog Timer

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Software

The ACL-8454 is supported by a set of drivers and examples, the standard software includes a C function library.

An extensive library of functions are available that support Microsoft C(6.0 and 7.0) and Borland C/C++(4.0). In additions, many example programs are included to demonstrate how to write C program for ACL-8454.
- Frequency measurement
- Pulse width measurement
- Watch-dog timer
- Event counting

A high performance Windows DLL driver for timer/counter functions is available.

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Specifications

• I/O port address: Hex 200 ~ Hex 3F0(8 bytes)
• Interrupt Level : IRQ3 ~ IRQ15

Programmable Counter

• Type of Counter : Intel 8254 or equivalent
• Counter Mode : down, (Binary or BCD)
• Maximum Input Frequency : 8 MHz
• CLK Period : 125 ns
• Min.Counters : 6 independent 16-bit counters
  (up to 12 counters is optional)
• Input Low Voltage : -0.5 V Min., 0.8 V Max.
• Input High Voltage : 2.0 V Min., Vcc +0.5 V Max.
• Output Low Voltage : 0.45 V Max.
• Output High Voltage : 2.4 V Max.
• Base Frequency : 4 MHz
• Frequency Stability : ±100 PPM

Digital Output

• Output channels : 8
• Input logic low voltage :
  Max. 0.5 V @ 23 mA (sink)
  Max. 0.4 V @ 12 mA
• Input logic high Voltage :
  Min. 2.0 V @ 15 mA (source)
  Min. 24 V @ 3 mA
• Driving Capacity: all inputs and outputs are TTL/DTL compatible
  and outputs will drive 1 standard TTL load (74 series)
  or 4 LSTTL (74LS) loads

Digital Input

• Input channels : 8, up to 16
• Input logic low voltage : Min. -0.5 V; Max. 0.8 V
• Input logic high voltage : Min. 2.0 V; Max. 5.0 V
• Input loading current : Max. 0.2 mA @ 0.4 V
• Input hysteresis: typical 0.4 V; Min. 0.2 V

Physical/Environment

• Connector : 37-pin D-type female
• Operating temp : 0 ~ 50ºC
• Storage temp : -20 ~ +80ºC
• Humidity : 5~90%, non-condensing
• Dimensions : 175mm (L) x 121mm (W)
• Power consumption : +5V @ 600 mA typical, 1A max.

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Ordering Information

ACL-8454/6 : 6-channel Counter/Timer Card

ACL-8454/12 : 12-channel Counter/Timer Card

ACLD-9137 : Direct Screw Terminal Board

ACLS-DLL3 : Windows Drivers for ACL-8454

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