74LVC125 datasheet(5/10 Pages) PHILIPS

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Philips Semiconductors

Product specification

74LVC125

Quad buffer/line driver; 3-State

1997 Mar 18

AC CHARACTERISTICS

GND = 0 V; tr = tf = 2.5 ns; CL = 50 pF; RL = 500W; Tamb = –40_C to +85_C.

LIMITS

SYMBOL

PARAMETER

WAVEFORM

VCC = 3.3V ±0.3V

VCC = 2.7V

VCC = 1.2V

UNIT

MIN

TYP1

MAX

MIN

TYP

MAX

TYP

tPHL

tPLH

Propagation delay

nA to nY

Figure 1, 3

3.5

6.5

3.9

7.0

tPZH

tPZL

3-state output enable

time nOE to nY

Figure 2, 3

3.8

7.0

4.4

8.0

tPHZ

tPLZ

3-state output disable

time nOE to nY

Figure 2, 3

3.3

5.5

4.0

6.5

NOTE:

1. These typical values are at VCC = 3.3V and Tamb = 25°C.

AC WAVEFORMS

VM = 1.5 V at VCC w 2.7 V

VM = 0.5 × VCC at VCC < 2.7 V

VOL and VOH are the typical output voltage drop that occur with the

output load.

VX = VOL + 0.3 V at VCC ≥ 2.7 V;

VX = VOL + 0.1 × VCC at VCC < 2.7 V;

VY = VOH – 0.3 V at VCC ≥ 2.7 V;

VY = VOH – 0.1 × VCC at VCC < 2.7 V.

SV00459

nA INPUT

nY OUTPUT

tPLH

t PHL

GND

V OL

V OH

Figure 1. Input (nA) to output (nY) propagation delays.

SV00458

outputs

disabled

outputs

enabled

outputs

enabled

tPHZ

tPZH

tPZL

tPLZ

nOE Input

GND

VCC

VOL

VOH

GND

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

OUTPUT

LOW-to-OFF

OFF-to-LOW

Figure 2. 3-State enable and disable times.

TEST CIRCUIT

PULSE

GENERATOR

D.U.T.

50pF

< VCC

Open

GND

500

Ω

500

Ω

VCC

t 2.7V

VCC

2.7V – 3.6V

2.7V

Test

GND

tPLZ/tPZL

< VCC

tPHZ/tPZH

tPLH/tPHL

Open

SY00003

VCC

Figure 3. Load circuitry for switching times.

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