74LVT245B 查看數據表（PDF） - Philips Electronics
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74LVT245B Datasheet PDF : 10 Pages
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Philips Semiconductors
3.3V Octal transceiver with direction pin (3-State)
Product specification
74LVT245B
AC CHARACTERISTICS
GND = 0V; tR = tF = 2.5ns; CL = 50pF; RL = 500Ω; Tamb = –40°C to +85°C.
SYMBOL
PARAMETER
WAVEFORM
tPLH
Propagation delay
tPHL
An to Bn or Bn to An
1
tPZH
tPZL
Output enable time
to High and Low level
2
tPHZ
Output disable time
tPLZ
from High and Low Level
2
NOTES:
1. All typical values are at VCC = 3.3V and Tamb = 25°C.
AC WAVEFORMS
VM = 1.5V, VIN = GND to 2.7V
LIMITS
VCC = 3.3V +0.3V
MIN
TYP1
MAX
1.2
2.4
3.5
1.2
2.4
3.5
1.3
3.3
5.5
1.7
3.2
5.5
2.2
3.6
5.9
2.2
3.4
5.0
VCC = 2.7V
MAX
4.0
4.0
7.1
6.5
6.5
5.1
UNIT
ns
ns
ns
An or Bn
INPUT
Bn or An
OUTPUT
VM
tPHL
VM
VM
tPLH
VM
SA00192
Waveform 1. Input (An or Bn) to Output (Bn or An) Propagation
Delays
OE INPUT
1.5V
tPZL
1.5V
tPLZ
2.7V
0V
3.0V
An or Bn
OUTPUT
Bn or An
OUTPUT
1.5V
tPZH
1.5V
tPHZ
VOL + 0.3V
VOL
VOH
VOH – 0.3V
0V
SV00106
Waveform 2. 3-State Output Enable and Disable Times
1999 Mar 19
5
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