Data Sheet
CD74AC540, CDx4ACT54x, CDx4AC541 Octal Buffer/Line Drivers, 3-State
1 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
. ®FAST is a Registered Trademark of Fairchild Semiconductor
Corp.
2 Description
The CD54/74AC540, -541, and CD54/74ACT540, -541 octal buffer/line drivers use the RCA ADVANCED CMOS technology. The CD54/74AC/ACT540 are inverting 3-state buffers having two active-LOW output enables. The CD54/74AC/ACT541 are non-inverting 3-state buffers having two active-LOW output enables.
Device Information
| PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) | BODY SIZE(3) |
|---|---|---|---|
| CD74AC540, CDx4ACT54x, CDx4AC541 | DW (SOIC, 20) | 12.8mm x 10.3mm | 12.8mm x 7.5mm |
| DB (SSOP, 20) | 7.2mm x 7.8mm | 7.2mm x 5.3mm | |
| N (PDIP, 20) | 24.33mm x 9.4mm | 24.33mm x 6.35mm |
(1) For all available packages, see
Section 10.
(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 Block Diagram3 Pin Configuration and Functions
Figure 3-1 CDx4AC540,
CDx4ACT540
Figure 3-2 CDx4AC541,
CDx4ACT541Table 3-1 Pin Functions
| PIN | |||
|---|---|---|---|
| NO. | NAME | I/O1 | DESCRIPTION |
| !MR | 1 | I | Master reset, active low |
| Q0 | 2 | O | Output Q0 |
| D0 | 3 | I | Input D0 |
| D1 | 4 | I | Input D1 |
| Q1 | 5 | O | Output Q1 |
| Q2 | 6 | O | Output Q2 |
| D2 | 7 | I | Input D2 |
| D3 | 8 | I | Input D3 |
| Q3 | 9 | O | Output Q3 |
| GND | 10 | - | Ground |
| CP | 11 | I | Clock, rising edge triggered |
| Q4 | 12 | O | Output Q4 |
| D4 | 13 | I | Input D4 |
| D5 | 14 | I | Input D5 |
| Q5 | 15 | O | Output Q5 |
| Q6 | 16 | O | Output Q6 |
| D6 | 17 | I | Input D6 |
| D7 | 18 | I | Input D7 |
| Q7 | 19 | O | Output Q7 |
| VCC | 20 | - | Supply |
- I = input, O = output, P = power, FB = feedback, GND = ground, N/A = not applicable
