CDx4AC161 4-Bit Synchronous Binary Counters
1 Features
- Internal look-ahead for fast counting
- Carry output for n-bit cascading
- Synchronous counting
- Synchronously programmable
- SCR-latchup-resistant CMOS process and circuit design
- Exceeds 2kV ESD protection per MIL-STD-883, method 3015
2 Description
The ’AC161 devices are 4-bit binary counters. These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting.
Device Information
| PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) | BODY SIZE(3) |
|---|---|---|---|
| CDx4AC161 | E (PDIP, 16) | 19.3mm x 9.4mm | 19.3mm x 6.35mm |
| M (SOIC, 16) | 9.9mm x 6mm | 9.9mm x 3.9mm |
(1) For all available packages, see the package option addendum at
the end of the data sheet.
(2) The package size (length × width) is a nominal value and includes pins, where
applicable.
(3) The body size (length × width) is
a nominal value and does not include pins.
Logic Diagram (Positive Logic)3 Pin Configuration and Functions
Figure 3-1 CD54AC161 F Package, CD74AC161
E or M Package (Top View)| NAME | PIN | TYPE | DESCRIPTION |
|---|---|---|---|
| CLR | 1 | I | Clear, active low |
| CLK | 2 | I | Clock, rising edge triggered |
| A | 3 | I | Load data A |
| B | 4 | I | Load data B |
| C | 5 | I | Load data C |
| D | 6 | I | Load data D |
| ENP | 7 | I | Count enable, does not affect RCO |
| GND | 8 | — | Ground |
| LOAD | 9 | I | Parallel load, active low |
| ENT | 10 | I | Count enable, affects RCO |
| QD | 11 | O | QD output |
| QC | 12 | O | QC output |
| QB | 13 | O | QB output |
| QA | 14 | O | QA output |
| RCO | 15 | O | Ripple-carry output |
| VCC | 16 | __ | Supply |
