SN74LV8T164中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? Latching logic with known power-up state provides

consistent start-up behavior

? Wide operating range of 1.65V to 5.5V

? 5.5V tolerant input pins

? Single-supply voltage translator (refer to LVxT

Enhanced Input Voltage):

– Up translation:

? 1.2V to 1.8V

? 1.5V to 2.5V

? 1.8V to 3.3V

? 3.3V to 5.0V

– Down translation:

? 5.0V, 3.3V, 2.5V to 1.8V

? 5.0V, 3.3V to 2.5V

? 5.0V to 3.3V

? Up to 150Mbps with 5V or 3.3V VCC

? Supports standard function pinout

? Latch-up performance exceeds 250mA

per JESD 17

2 Applications

? Digital signage

? Controlling an indicator LED

? Increase the number of outputs on a

microcontroller

3 Description

The SN74LV8T164 device contains an 8-bit shift

register with AND-gated serial inputs and an

asynchronous clear (CLR) input. The gated serial (A

and B) inputs permit complete control over incoming

data; a low at either input inhibits entry of the new

data and resets the first flip-flop to the low level at

the next clock (CLK) pulse. A high-level input enables

the other input, which then determines the state of the

first flip-flop. Data at the serial inputs can be changed

while CLK is high or low, provided the minimum set-up

time requirements are met. Clocking occurs on the

low-to-high-level transition of CLK.

The input is designed with a reduced threshold circuit

to support up translation when the supply voltage

is larger than the input voltage. Additionally, the 5V

tolerant input pins enable down translation when the

input voltage is larger than the supply voltage. The

output level is always referenced to the supply voltage

(VCC) and supports 1.8V, 2.5V, 3.3V, and 5V CMOS

levels.