SGS-THOMSON M54HC251, M74HC251 Technical data
M54HC251
.HIGH SPEED
.tPD = 14 ns (TYP.) AT VCC = 5 V LOW POWER DISSIPATION
.ICC = 4 μA (MAX.) AT TA = 25 °C 6 V HIGH NOISE IMMUNITY
.VNIH = VNIL = 28 % VCC (MIN.) OUTPUT DRIVE CAPABILITY
.10 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE
. IOH = IOL = 4 mA (MIN.) BALANCED PROPAGATION DELAYS
.tPLH = tPHL
WIDE OPERATING VOLTAGE RANGE
.VCC (OPR) = 2 V TO 6 V
PIN AND FUNCTION COMPATIBLE WITH 54/74LS251
DESCRIPTION
The M54/74HC251 is a high speed CMOS 8-CHAN- NEL MULTIPLEXER (3-STATE) fabricated in silicon gate C2MOS technology. It has the same high speed performance of LSTTL combined with true CMOS low power consumption. This multiplexer features both true (Y) and complement (W) outputs as well as STROBE input. The STROBE must be 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 determines which data input is routed to Y and W. All inputs are equipped with protection circuits against static discharge and transient excess voltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
M54HC251
M74HC251
8 BIT SIPO SHIFT REGISTER
B1R |
F1R |
(Plastic Package) |
(Ceramic Package) |
M1R |
C1R |
(Micro Package) |
(Chip Carrier) |
ORDER CODES : |
|
M54HC251F1R |
M74HC251M1R |
M74HC251B1R |
M74HC251C1R |
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
February 1993 |
1/11 |
M54/M74HC251
TRUTH TABLE
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INPUTS |
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OUTPUS |
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STROBE |
Y |
W |
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C |
B |
A |
S |
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X |
X |
X |
H |
Z |
Z |
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L |
L |
L |
L |
D0 |
D0 |
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L |
L |
H |
L |
D1 |
D1 |
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L |
H |
L |
L |
D2 |
D2 |
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L |
H |
H |
L |
D3 |
D3 |
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H |
L |
L |
L |
D4 |
D4 |
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H |
L |
H |
L |
D5 |
D5 |
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H |
H |
L |
L |
D6 |
D6 |
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H |
H |
H |
L |
D7 |
D7 |
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X: Don't Care |
Z: HIGH Impedance |
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LOGIC DIAGRAM
2/11
M54/M74HC251
PIN DESCRIPTION |
IEC LOGIC SYMBOL |
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PIN No |
SYMBOL |
NAME AND FUNCTION |
4, 3, 2, 1, |
D0 to D7 |
Multiplexer Inputs |
15, 14, 13, |
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12 |
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5 |
Y |
Multiplexer Output |
6W Complementary Multiplexer Output
7 |
STROBE |
3 State Output Enable |
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Input |
11, 10, 9 |
A, B, C |
Select Inputs |
8 |
GND |
Ground (0V) |
16 |
VCC |
Positive Supply Voltage |
ABSOLUTE MAXIMUM RATINGS
Symbol |
Parameter |
Value |
Unit |
VCC |
Supply Voltage |
-0.5 to +7 |
V |
VI |
DC Input Voltage |
-0.5 to VCC + 0.5 |
V |
VO |
DC Output Voltage |
-0.5 to VCC + 0.5 |
V |
IIK |
DC Input Diode Current |
± 20 |
mA |
IOK |
DC Output Diode Current |
± 20 |
mA |
IO |
DC Output Source Sink Current Per Output Pin |
± 25 |
mA |
ICC or IGND |
DC VCC or Ground Current |
± 50 |
mA |
PD |
Power Dissipation |
500 (*) |
mW |
Tstg |
Storage Temperature |
-65 to +150 |
oC |
TL |
Lead Temperature (10 sec) |
300 |
oC |
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW: 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC
RECOMMENDED OPERATING CONDITIONS
Symbol |
Parameter |
|
Value |
Unit |
VCC |
Supply Voltage |
|
2 to 6 |
V |
VI |
Input Voltage |
|
0 to VCC |
V |
VO |
Output Voltage |
|
0 to VCC |
V |
Top |
Operating Temperature: M54HC Series |
|
-55 to +125 |
oC |
|
M74HC Series |
|
-40 to +85 |
oC |
tr, tf |
Input Rise and Fall Time |
VCC = 2 V |
0 to 1000 |
ns |
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VCC = 4.5 V |
0 to 500 |
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VCC = 6 V |
0 to 400 |
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3/11
M54/M74HC251
DC SPECIFICATIONS
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Test Conditions |
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Value |
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Symbol |
Parameter |
VCC |
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TA = 25 oC |
-40 to 85 oC |
-55 to 125 oC |
Unit |
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54HC and 74HC |
74HC |
54HC |
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(V) |
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Min. Typ. Max. Min. Max. Min. Max. |
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VIH |
High Level Input |
2.0 |
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1.5 |
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1.5 |
1.5 |
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Voltage |
4.5 |
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3.15 |
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3.15 |
3.15 |
V |
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6.0 |
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4.2 |
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4.2 |
4.2 |
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VIL |
Low Level Input |
2.0 |
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0.5 |
0.5 |
0.5 |
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Voltage |
4.5 |
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1.35 |
1.35 |
1.35 |
V |
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6.0 |
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1.8 |
1.8 |
1.8 |
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VOH |
High Level |
2.0 |
VI = |
IO=-20 μA |
1.9 |
2.0 |
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1.9 |
1.9 |
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Output Voltage |
4.5 |
4.4 |
4.5 |
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4.4 |
4.4 |
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VIH |
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V |
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6.0 |
or |
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5.9 |
6.0 |
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5.9 |
5.9 |
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4.5 |
VIL |
IO=-4.0 mA |
4.18 |
4.31 |
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4.13 |
4.10 |
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6.0 |
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IO=-5.2 mA |
5.68 |
5.8 |
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5.63 |
5.60 |
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VOL |
Low Level Output |
2.0 |
VI = |
IO= 20 μA |
|
0.0 |
0.1 |
0.1 |
0.1 |
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Voltage |
4.5 |
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0.0 |
0.1 |
0.1 |
0.1 |
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VIH |
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V |
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6.0 |
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0.0 |
0.1 |
0.1 |
0.1 |
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or |
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4.5 |
VIL |
IO= 4.0 mA |
|
0.17 |
0.26 |
0.33 |
0.40 |
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6.0 |
|
IO= 5.2 mA |
|
0.18 |
0.26 |
0.33 |
0.40 |
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II |
Input Leakage |
6.0 |
VI = VCC or GND |
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±0.1 |
±1 |
±1 |
μA |
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Current |
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IOZ |
3 State Output |
6.0 |
VI = VIH or VIL |
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±0.5 |
±5.0 |
±10 |
μA |
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Off State Current |
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VO = VCC or GND |
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ICC |
Quiescent Supply |
6.0 |
VI = VCC or GND |
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4 |
40 |
80 |
μA |
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Current |
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4/11
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