Data Sheet
SN74AHCT139-Q1Automotive Dual 2-Line to 4-Line Decoders or Demultiplexers
1 Features
- AEC-Q100 qualified for automotive
applications:
- Device temperature grade 1: -40°C to +125°C
- Device HBM ESD classification level 2
- Device CDM ESD classification level C4B
- Available in wettable flank QFN package
- Operating range 4.5V to 5.5V VCC
- TTL-Compatible inputs
- Low delay, 9.6ns max (VCC = 5V, CL = 50pF
- Latch-up performance exceeds 250mA
per JESD 17
2 Applications
- Drive an indicator LED
- Level-shift using open-drain outputs
- Control a relay
3 Description
The SN74AHCT139-Q1 contains two 2-line to 4-line decoders/demultiplexers. These devices are designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When used with high-speed memories utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory usually are less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.
Package Information
| PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) | BODY SIZE (NOM)(3) |
|---|---|---|---|
| SN74AHCT139-Q1 | BQB (WQFN, 16) | 3.5mm × 2.5mm | 3.5mm × 2.5mm |
| PW (TSSOP, 16) | 5mm × 6.4mm | 5mm × 4.4mm |
(1) For more information, see Section 11.
(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 for Each Channel (Positive Logic)4 Pin Configuration and Functions
Figure 4-1 PW
Package,16-Pin TSSOP
(Top View)
Figure 4-2 BQB
Package,16-Pin WQFN
(Top View)
Table 4-1 Pin Functions
| PIN | TYPE(1) | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| 1G | 1 | I | Channel 1 strobe input, active low |
| 1A0 | 2 | I | Channel 1 select input 0 |
| 1A1 | 3 | I | Channel 1 select input 1 |
| 1Y0 | 4 | O | Channel 1 output 0 |
| 1Y1 | 5 | O | Channel 1 output 1 |
| 1Y2 | 6 | O | Channel 1 output 2 |
| 1Y3 | 7 | O | Channel 1 output 3 |
| GND | 8 | G | Ground |
| 2Y3 | 9 | O | Channel 2 output 3 |
| 2Y2 | 10 | O | Channel 2 output 2 |
| 2Y1 | 11 | O | Channel 2 output 1 |
| 2Y0 | 12 | O | Channel 2 output 0 |
| 2A1 | 13 | I | Channel 2 input 1 |
| 2A0 | 14 | I | Channel 2 input 0 |
| 2G | 15 | I | Channel 2 strobe input, active low |
| VCC | 16 | P | Positive supply |
| Thermal pad(2) | — | The thermal pad can be connected to GND or left floating. Do not connect to any other signal or supply. | |
(1) Signal Types: I = Input, O = Output, I/O
= Input or Output, P = Power, G = Ground.
(2) WBQB package only.