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7LVC245APWDH Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer 7LVC245APWDH
Beschreibung Octal bus transceiver with direction pin with 5-volt tolerant inputs/outputs 3-State
Hersteller NXP Semiconductors
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Gesamt 10 Seiten
7LVC245APWDH Datasheet, Funktion
INTEGRATED CIRCUITS
74LVC245A/74LVCH245A
Octal bus transceiver with direction pin
with 5-volt tolerant inputs/outputs
(3-State)
Product specification
Supersedes data of 1997 Dec 19
IC24 Data Handbook
1998 May 20
Philips
Semiconductors






7LVC245APWDH Datasheet, Funktion
Philips Semiconductors
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
Product specification
74LVC245A
74LVCH245A
AC CHARACTERISTICS
GND = 0V; tr = tf v 2.5ns; CL = 50pF; RL = 500; Tamb = –40°C to +85°C.
LIMITS
SYMBOL
PARAMETER
WAVEFORM
VCC = 3.3V ±0.3V
MIN TYP1 MAX
VCC = 2.7V
MIN MAX
tPHL
tPLH
Propagation delay
An to Bn;
Bn to An
1, 3 1.5 3.6 6.3 1.5 7.3
tPZH
tPZL
3-State output enable time
OE to An;
OE to Bn
2, 3 1.5 5.1 8.5 1.5 9.5
tPHZ
tPLZ
3-State output disable time
OE to An;
OE to Bn
2, 3 1.5 4.5 7.0 1.5 8.0
NOTE:
1. Unless otherwise stated, all typical values are at VCC = 3.3V and Tamb = 25°C.
VCC = 1.2V
TYP
16
23
16
UNIT
ns
ns
ns
AC WAVEFORMS
VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V.
VOL and VOH are the typical output voltage drop that occur with the
output load.
VX = VOL + 0.3V at VCC w 2.7V; VX = VOL + 0.1 VCC at VCC t 2.7V
VY = VOH –0.3V at VCC w 2.7V; VY = VOH – 0.1 VCC at VCC t 2.7V
VI
INPUT
VM
GND
VOH
tPHL
tPLH
OUTPUT
VM
VOL
SY00041
Waveform 1. Input (Dn) to output (Qn) propagation delays.
VI
nOE INPUT
GND
VCC
Qn OUTPUT
LOW-to-OFF
OFF-to-LOW
VOL
VM
tPLZ
VX
tPZL
VM
TEST CIRCUIT
VCC
PULSE
GENERATOR
VIN
RT
D.U.T.
VOUT
CL
S1
2<VCC
Open
GND
RL=500
RL=500
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
SWITCH
Open
2<VCC
GND
VCC
t 2.7V
2.7 – 3.6V
VIN
VCC
2.7V
DEFINITIONS
RL = Load resistor
CL = Load capacitance includes jig and probe capacitance
RT = Termination resistance should be equal to ZOUT
of pulse generators.
SW00047
Waveform 3. Load circuitry for switching times.
VOH
Qn OUTPUT
HIGH-to-OFF
OFF-to-HIGH
GND
tPHZ
outputs
enabled
tPZH
VY
outputs
disabled
VM
outputs
enabled
Waveform 2. 3-State enable and disable times.
SW00207
1998 May 20
6

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