Philips Semiconductors Product specification
74LV2518-input multiplexer (3-State)
2
1998 May 20 853–1967 19420
FEATURES
• Optimized for low voltage applications: 1.0 to 3.6 V
• Accepts TTL input levels between V
CC
= 2.7 V and V
CC
= 3.6 V
• Typical V
OLP
(output ground bounce) < 0.8 V at V
CC
= 3.3 V,
T
amb
= 25°C
• Typical V
OHV
(output V
OH
undershoot) > 2 V at V
CC
= 3.3 V,
T
amb
= 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
• I
CC
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 (I
0
to I
7
), an
output enable input (OE
) and three select inputs (S
0
, S
1
, S
2
). 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; T
amb
= 25°C; t
r
= t
f
≤ 2.5 ns
SYMBOL
PARAMETER CONDITIONS TYPICAL UNIT
t
PHL
/t
PLH
Propagation delay
I
n
to Y
I
n
to Y
S
n
to Y
S
n
to Y
C
L
= 15 pF;
V
CC
= 3.3 V
14
16
19
20
ns
C
I
Input capacitance 3.5 pF
C
PD
Power dissipation capacitance per gate
V
CC
= 3.3 V
V
I
= GND to V
CC
1
44 pF
NOTE:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in µW)
P
D
= C
PD
× V
CC
2
× f
i
(C
L
× V
CC
2
× f
o
) where:
f
i
= input frequency in MHz; C
L
= output load capacitance in pF;
f
o
= output frequency in MHz; V
CC
= supply voltage in V;
(C
L
× V
CC
2
× f
o
) = sum of the outputs.
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #
16-Pin Plastic DIL –40°C to +125°C 74LV251 N 74LV251 N SOT38-4
16-Pin Plastic SO –40°C to +125°C 74LV251 D 74LV251 D SOT109-1
16-Pin Plastic SSOP Type II –40°C to +125°C 74LV251 DB 74LV251 DB SOT338-1
16-Pin Plastic TSSOP Type I –40°C to +125°C 74LV251 PW 74LV251PW DH SOT403-1
