SN74LV2T74BQAR中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? Wide operating range of 1.8 V to 5.5 V

? Single-supply voltage translator (refer to LVxT

Enhanced Input Voltage):

– Up translation:

? 1.2 V to 1.8 V

? 1.5 V to 2.5 V

? 1.8 V to 3.3 V

? 3.3 V to 5.0 V

– Down translation:

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

? 5.0 V, 3.3 V to 2.5 V

? 5.0 V to 3.3 V

? 5.5-V tolerant input pins

? Supports standard pinouts

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

? Latch-up performance exceeds 250 mA

per JESD 17

2 Applications

? Convert a momentary switch to a toggle switch

? Hold a signal during controller reset

? Input slow edge-rate signals

? Operate in noisy environments

? Divide a clock signal by two

3 Description

The SN74LV2T74 contains two independent D-type

positive-edge-triggered flip-flops. A low level at the

preset (PRE) input sets the output high. A low

level at the clear (CLR) input resets the output low.

Preset and clear functions are asynchronous and not

dependent on the levels of the other inputs. When

PRE and CLR are inactive (high), data at the data

(D) input meeting the setup time requirements is

transferred to the outputs (Q, Q) on the positive-going

edge of the clock (CLK) pulse. Clock triggering occurs

at a voltage level and is not directly related to the

rise time of the input clock (CLK) signal. Following

the hold-time interval, data at the data (D) input can

be changed without affecting the levels at the outputs

(Q, Q). The output level is referenced to the supply

voltage (VCC) and supports 1.8-V, 2.5-V, 3.3-V, and

5-V CMOS levels.

The input is designed with a lower threshold circuit to

support up translation for lower voltage CMOS inputs

(for example, 1.2 V input to 1.8 V output or 1.8 V input

to 3.3 V output). In addition, the 5-V tolerant input pins

enable down translation (for example, 3.3 V to 2.5 V

output).