1 Features

1? Can Be Used as Two 16-Bit Counters or a Single

32-Bit Counter

? 8-bit counter read bus

? 2-V to 5.5-V VCC Operation

? Maximum tpd of 25 ns at 5 V (RCLK to Y)

? Typical VOLP (Output Ground Bounce)

< 0.7 V at VCC = 5 V, TA = 25°C

? Typical VOHV (Output VOH Undershoot)

> 4.4 V at VCC = 5 V, TA = 25°C

? Ioff Supports Partial-Power-Down Mode Operation

? Latch-Up Performance Exceeds 250 mA

Per JESD 17

? ESD Protection Exceeds JESD 22

– 2000-V Human Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

2 Applications

? Up Counters

? Dual Up Counters

3 Description

The SN74LV8154 device is a dual 16-bit binary

counter with 3-state output registers, designed for 2-V

to 5.5-V VCC operation.

The counters have dedicated clock inputs. The

counters share a clocked storage register to sample

and save the counter contents. Both counters share

an asynchronous clear input. The 32-bit storage

register can be mapped on the output bus 8-bits at a

time. Four bus reads are needed to access the

contents of both stored counts. The two counters can

be chained by connecting CLKBEN to RCOA. All

clocks are positive edge triggered. All other inputs are

active low.

This device is fully specified for partial-power-down

applications using Ioff. The Ioff circuitry disables the

outputs, preventing damaging current backflow

through the device when it is powered down.