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HD74HC251P中文资料

HD74HC251P中文资料
HD74HC251P中文资料

HD74HC251

1 of 8 Data Selectors/Multiplexers (with 3-state outputs)

REJ03D0599–0200

(Previous ADE-205-476)

Rev.2.00

Jan 31, 2006 Description

This multiplexer features both true (Y) and complement (W) outputs as well as a strobe input. The strobe must be at a low logic level to enable this device. When the strobe input is high, both outputs are in the high impedance state. When enabled, address information on the data select inputs determine which data input is routed to the Y and W outputs.

Features

? High Speed Operation: t pd (A, B, C to Y) = 20 ns typ (C L = 50 pF)

? High Output Current: Fanout of 10 LSTTL Loads

? Wide Operating Voltage: V CC = 2 to 6 V

? Low Input Current: 1 μA max

? Low Quiescent Supply Current: I CC (static) = 4 μA max (Ta = 25°C)

? Ordering Information

Part Name Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74HC251P DILP-16

pin PRDP0016AE-B

(DP-16FV)

P —

HD74HC251FPEL SOP-16 pin (JEITA) PRSP0016DH-B

(FP-16DAV)

FP EL (2,000 pcs/reel)

HD74HC251RPEL SOP-16 pin (JEDEC) PRSP0016DG-A

(FP-16DNV)

RP EL (2,500 pcs/reel)

Note: Please consult the sales office for the above package availability.

Function Table

Inputs

Select Strobe

Outputs

C B A S Y W

X X X H Z Z L L L L D0D0

L L H L D1D1

L H L L D2D2

L H H L D3D3

H L L L D4D4

H L H L D5D5

H H L L D6D6

H H H L D7D7

Notes: 1. H: high level, L: low level, X: irrelevant

2. Z; high impedance (off-state)

3.

D0 through D7; the level of the respective D input.

Pin Arrangement

Logic Diagram

Absolute Maximum Ratings

Unit Item Symbol

Ratings

Supply voltage range V CC–0.5 to 7.0 V

Input / Output voltage V IN, V OUT–0.5 to V CC +0.5 V

Input / Output diode current I IK, I OK±20 mA Output current I O±25 mA

V CC, GND current I CC or I GND±50 mA

mW Power dissipation P T 500

Storage temperature Tstg –65 to +150 °C

Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may be realized at the same time.

Recommended Operating Conditions

Item Symbol Ratings Unit Conditions

Supply voltage V CC 2 to 6 V Input / Output voltage V IN , V OUT 0 to V CC V Operating temperature Ta –40 to 85 °C

0 to 1000 V CC = 2.0 V

0 to 500 V CC = 4.5 V Input rise / fall time *1

t r , t f 0 to 400 ns V CC = 6.0 V Notes: 1. This item guarantees maximum limit when one input switches.

Waveform: Refer to test circuit of switching characteristics.

Electrical Characteristics

Ta = 25°C Ta = –40 to+85°C

Item Symbol V CC (V)

Min Typ Max Min Max

Unit

Test Conditions

2.0 1.5 — — 1.5 — 4.5

3.15 — — 3.15 — V IH

6.0 4.2 — — 4.2 — V 2.0 — — 0.5 — 0.5 4.5 — — 1.35 — 1.35 Input voltage

V IL

6.0 — — 1.8 — 1.8

V 2.0 1.9 2.0 — 1.9 — 4.5 4.4 4.5 — 4.4 — 6.0 5.9 6.0 — 5.9 — I OH = –20 μA

4.5 4.18 — — 4.13 — I OH = –4 mA V OH

6.0 5.68 — — 5.63

— V Vin = V IH or V IL I OH = –5.2 mA 2.0 — 0.0 0.1 —

0.1 4.5 — 0.0 0.1 — 0.1 6.0 — 0.0 0.1 — 0.1 I OL = 20 μA 4.5 — — 0.26 — 0.33 I OL = 4 mA Output voltage V OL 6.0 — — 0.26 —

0.33 V Vin = V IH or V IL I OL = 5.2 mA Off-state output

current

I OZ 6.0

— — ±0.5 — ±5.0 μA Vin = V IH or V IL ,

Vout = V CC or GND

Input current Iin 6.0 — — ±0.1 — ±1.0 μA Vin = V CC or GND

Quiescent supply current I CC 6.0

— — 4.0 — 40 μA Vin = V CC or GND, Iout = 0 μA

Switching Characteristics

(C L = 50 pF, Input t r = t f = 6 ns)

Ta = 25°C Ta = –40 to +85°C

Item Symbol V CC (V)

Min Typ Max Min Max

Unit

Test Conditions 2.0 — — 205 — 255 4.5 — 20 41 — 51 t PLH t PHL 6.0 — — 35 — 43 ns A, B or C to Y

2.0 — — 205 — 255 4.5 —

20 41 — 51 t PLH t PHL 6.0 — — 35 — 43 ns A, B or C to W

2.0 — — 195 — 245 4.5 — 17 39 — 49 t PLH t PHL 6.0 — — 33 — 42 ns Data to Y

2.0 — — 185 — 230 4.5 — 17 37 — 46 Propagation delay

time

t PLH t PHL

6.0 — — 31 — 39 ns Data to W

2.0 — — 150 — 190 4.5 — 11 30 — 38 t ZH t ZL 6.0 — — 26 — 33 ns strobe to W R L = 1 k ?

2.0 — — 145 — 180 4.5 — 11 29 — 36

Output enable time

t ZH t ZL

6.0 — — 25 — 31

ns strobe to Y R L = 1 k ?

2.0 — — 220 — 275 4.5 — 12 44 — 55 t HZ t LZ 6.0 — — 37 — 47

ns strobe to W R L = 1 k ?

2.0 — — 195 — 245 4.5 — 12 39 — 49 Output disable time

t HZ t LZ

6.0 — — 33 — 42

ns strobe to Y R L = 1 k ?

2.0 — — 75 — 90 4.5 — 5 15 — 19 Output rise/fall time

t TLH t THL 6.0 — — 13 — 16 ns Input capacitance Cin

— — 5 10 —

10 pF

Test Circuit

Waveforms

Package Dimensions

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