CDx4AC299, CD74AC323, CDx4ACT299 8-Lnput Universal Shift/Storage Register with Common Parallel I/O Pins
1 Features
Type Features
- Buffered inputs
- Typical propagation delay:
6ns @ V CC = 5V, T A = 25°C, C L = 50pF
Family Features
- SCR-Latchup-resistant CMOS process and circuit design
- Speed of bipolar FAST*/AS/S with significantly reduced power consumption
- Balanced propagation delays
- AC types feature 1.5V to 5.5V operation and balanced noise immunity at 30% of the supply
- ± 24mA output drive current
- Fanout to 15 FAST* ICs
- Drives 50ohm transmission lines
R_FAMILY_FEATURES_FN1. *FAST is a Registered Trademark of
Fairchild Semiconductor Corp.
2 Description
The RCA CDx4AC299 and CD74AC323 and the CDx4ACT299 are 3-state, 8-input universal shift/storage registers with common parallel I/O pins.
Device Information
| PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) | BODY SIZE(3) |
|---|---|---|---|
| CDx4AC(T)299/ CD74AC323 | DW (SOIC, 20) | 12.80mm × 10.3mm | 12.80mm × 7.50mm |
(1) For all available packages, see
the orderable 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.
Functional Diagram3 Pin Configuration and Functions
Figure 3-1 Terminal
AssignmentPin Functions
| PIN | TYPE1 | DESCRIPTION | |
|---|---|---|---|
| NO. | NAME | ||
| 1 | SO | I | Mode select 0 |
| 2 | !OE1 | I | Output enable, active low |
| 3 | !OE2 | I | Output enable, active low |
| 4 | I/O6 | O | Parallel data input/output |
| 5 | I/O4 | O | Parallel data input/output |
| 6 | I/O2 | O | Parallel data input/output |
| 7 | I/O0 | O | Parallel data input/output |
| 8 | Q0 | O | Serial output |
| 9 | !MR | I | Master reset, active low |
| 10 | GND | - | Ground |
| 11 | DSO | I | Serial data input |
| 12 | CP | I | Clock, rising edge triggered |
| 13 | I/O1 | O | Parallel data input/output |
| 14 | I/O3 | O | Parallel data input/output |
| 15 | I/O5 | O | Parallel data input/output |
| 16 | I/O7 | O | Parallel data input/output |
| 17 | Q7 | O | Serial output |
| 18 | DS7 | I | Serial data input |
| 19 | S1 | I | Mode select |
| 20 | VCC | - | Supply |
(1) Signal Types: I = Input, O =
Output, I/O = Input or Output
