74LV251 查看數據表（PDF） - Philips Electronics
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74LV251 Datasheet PDF : 12 Pages
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Philips Semiconductors
8-input multiplexer (3-State)
Product specification
74LV251
FEATURES
• Optimized for low voltage applications: 1.0 to 3.6 V
• Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V
• Typical VOLP (output ground bounce) < 0.8 V at VCC = 3.3 V,
Tamb = 25°C
• Typical VOHV (output VOH undershoot) > 2 V at VCC = 3.3 V,
Tamb = 25°C
• True and complement outputs
• Both outputs are 3-State for further multiplexer expansion
• Multifunction capability
• Permits multiplexing from n-lines to one line
• Output capability: standard
• ICC category: MSI
DESCRIPTION
The 74LV251 is a low-voltage Si-gate CMOS device and is pin and
function compatible with 74HC/HCT251.
The 74LV251 is an 8-input multiplexer with 8 binary inputs (I0 to I7), an
output enable input (OE) and three select inputs (S0, S1, S2). One of
the eight binary inputs is selected by the select inputs and is routed to
the outputs (Y, Y). Both outputs are in the high impedance OFF-state
(Z) when the output enable input is HIGH, allowing multiplexer
expansion by tying the outputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25°C; tr = tf ≤ 2.5 ns
SYMBOL
PARAMETER
CONDITIONS
tPHL/tPLH
Propagation delay
In to Y
In to Y
Sn to Y
Sn to Y
CL = 15 pF;
VCC = 3.3 V
CI
Input capacitance
CPD
Power dissipation capacitance per gate
VCC = 3.3 V
VI = GND to VCC1
NOTE:
1. CPD is used to determine the dynamic power dissipation (PD in µW)
PD = CPD × VCC2 × fi )ȍ (CL × VCC2 × fo) where:
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
ȍ (CL × VCC2 × fo) = sum of the outputs.
TYPICAL
14
16
19
20
3.5
44
UNIT
ns
pF
pF
ORDERING INFORMATION
PACKAGES
16-Pin Plastic DIL
16-Pin Plastic SO
16-Pin Plastic SSOP Type II
16-Pin Plastic TSSOP Type I
TEMPERATURE RANGE OUTSIDE NORTH AMERICA
–40°C to +125°C
74LV251 N
–40°C to +125°C
74LV251 D
–40°C to +125°C
74LV251 DB
–40°C to +125°C
74LV251 PW
NORTH AMERICA
74LV251 N
74LV251 D
74LV251 DB
74LV251PW DH
PKG. DWG. #
SOT38-4
SOT109-1
SOT338-1
SOT403-1
1998 May 20
2
853–1967 19420
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