SN74HCS137PWR

Overview

The SN74HCS137PWR is a 3-to-8 line decoder/demultiplexer with address latches and Schmitt-trigger inputs. It operates within a supply voltage range of 2 V to 6 V and supports an ambient temperature range from -40°C to +125°C. The device features balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V. Propagation delay ranges from 6 ns to 51 ns depending on voltage and temperature. It is housed in a 16-pin TSSOP package.

Feature Summary

• Schmitt-trigger inputs provide high noise immunity and tolerance for slow input signals
• Address latch function retains state when latch enable is active
• Dual strobe inputs allow for cascading and demultiplexing operations

Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data

Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-16 package configuration. Confirm that the component meets the required operating temperature range of -40°C to +125°C for your application environment. Ensure proper decoupling capacitors are placed near the VCC and GND pins during implementation.

Selection Notes

Select this component when latched decoding is required to maintain address states independently of input changes. The inclusion of Schmitt triggers makes it suitable for noisy environments or applications with slow signal transitions. Verify that the output drive capability matches the load requirements, as excessive capacitance may impact performance.

Part Context

This part belongs to the Texas Instruments SN74HCS series, which utilizes high-speed silicon gate CMOS technology. The HCS designation indicates the inclusion of Schmitt-trigger inputs for enhanced noise rejection compared to standard HC logic families. It serves as a specialized decoder variant within the broader logic IC portfolio.

Replacement Considerations

SN74HCS137D (SOIC-16 package)

FAQ

How does the latch enable input affect the decoder operation?

When the latch enable input is low, the device functions as a standard decoder. When high, the address latches retain their previous state regardless of changes at the address select inputs.

What is the purpose of the dual strobe inputs?

The two strobe inputs simplify cascading multiple devices and facilitate demultiplexing functions by forcing all outputs high when active.