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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