SN54165, SN54LS165A, SN74165, SN74LS165A are parallel-load 8-bit shift registers manufactured by Texas Instruments. They have complementary outputs, direct overriding load (data) inputs, gated clock inputs, and parallel-to-serial data conversion function.
The document describes the SN54165 and SN74165 devices as obsolete products no longer supplied by Texas Instruments. It details their function as 8-bit serial shift registers with parallel-in access, featuring gated clock inputs and complementary outputs from the eighth bit.
Technical specifications are provided for both the original TTL series (SN54165/SN74165) and Low-Power Schottky variants (SN54LS165A/SN74LS165A). The datasheet includes absolute maximum ratings, recommended operating conditions, electrical characteristics over temperature, and switching characteristics including propagation delay times.
| Number of bits | 8-bit |
|---|---|
| Maximum clock frequency (SN54165/SN74165) | 26 MHz |
| Maximum clock frequency (SN54LS165A/SN74LS165A) | 35 MHz |
| Operating temperature range (SN54165/SN74165) | -55°C to 125°C |
| Operating temperature range (SN54LS165A/SN74LS165A) | -55°C to 125°C |
No, these devices are obsolete and are no longer supplied.
The maximum clock frequency (fmax) for the SN54LS165A and SN74LS165A is 35 MHz.