74VHC257T Datasheet PDF - STMicroelectronics
Part Number | 74VHC257T | |
Description | QUAD 2 CHANNEL MULTIPLEXER 3-STATE | |
Manufacturers | STMicroelectronics | |
Logo | ||
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QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
s HIGH SPEED: tPD = 3.7 ns (TYP.) at VCC = 5V
s LOWPOWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
s POWER DOWN PROTECTION ON INPUTS
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
s BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 5.5V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
s IMPROVED LATCH-UP IMMUNITY
s LOWNOISE VOLP = 0.8V (Max.)
DESCRIPTION
The 74VHC257 is an advanced high-speed
CMOS QUAD 2 CHANNEL MULTIPLEXER
(3-STATE) fabricated with sub-micron silicon gate
and double-layer metal wiring C2MOS
technology.
It is composed of four independent 2 channel
multiplexers with common SELECT and ENABLE
INPUT.
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74VHC257M
74VHC257T
The 74VHC257 is a non inverting multiplexer.
When the ENABLE INPUT is held ”High”, all
outputs become high impedance state. If
SELECT INPUT is held ”Low”, ”A” data is
selected, when SELECT INPUT is ”High”, ”B”
data is chosen.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage. This device can be
used to interface 5V to 3V.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
June 1999
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TEST CIRCUIT
74VHC257
TEST
tPLH, tPHL
tPZL, tPLZ
tPZH, tPHZ
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RL = R1 = 1KΩ orequivalent
RT = ZOUT of pulse generator (typically 50Ω)
SW IT CH
Open
VCC
GND
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS (f=1MHz; 50% duty cycle)
5/9
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Information | Total 9 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ 74VHC257T.PDF Datasheet ] |
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Featured Datasheets
Part Number | Description | MFRS |
74VHC257 | The function is QUAD 2 CHANNEL MULTIPLEXER 3-STATE. STMicroelectronics | |
74VHC257M | The function is QUAD 2 CHANNEL MULTIPLEXER 3-STATE. STMicroelectronics | |
74VHC257T | The function is QUAD 2 CHANNEL MULTIPLEXER 3-STATE. STMicroelectronics | |
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