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74AHC245 Datasheet

Octal bus transceiver; 3-state

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INTEGRATED CIRCUITS
DATA SHEET
74AHC245; 74AHCT245
Octal bus transceiver; 3-state
Product specification
Supersedes data of 1998 Sep 21
File under Integrated Circuits, IC06
1999 Sep 28


NXP Semiconductors Electronic Components Datasheet

74AHC245 Datasheet

Octal bus transceiver; 3-state

No Preview Available !

Philips Semiconductors
Octal bus transceiver; 3-state
Product specification
74AHC245; 74AHCT245
FEATURES
ESD protection:
HBM EIA/JESD22-A114-A
exceeds 2000 V
MM EIA/JESD22-A115-A
exceeds 200 V
CDM EIA/JESD22-C101
exceeds 1000 V
Balanced propagation delays
All inputs have a Schmitt-trigger
action
Inputs accepts voltages higher than
VCC
For AHC only:
operates with CMOS input levels
For AHCT only:
operates with TTL input levels
Specified from
40 to +85 and +125 °C.
DESCRIPTION
The 74AHC/AHCT245 is a
high-speed Si-gate CMOS device.
The 74AHC/AHCT245 is an octal
transceiver featuring non-inverting
3-state bus compatible outputs in
both send and receive directions.
The 74AHC245/74AHCT245 features
an Output Enable (OE) input for easy
cascading and a send/receive (DIR)
input for direction control.
OE controls the outputs so that the
buses are effectively isolated.
FUNCTION TABLE
See Note 1.
INPUTS
OE DIR
LL
LH
HX
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
INPUTS/OUTPUTS
An
A=B
inputs
Z
Bn
inputs
B=A
Z
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf 3.0 ns.
SYMBOL PARAMETER
CONDITIONS
TYPICAL
UNIT
AHC AHCT
tPHL/tPLH
propagation delay CL = 15 pF;
An to Bn, Bn to An VCC = 5 V
3.5 5.0 ns
CI input capacitance VI = VCC or GND 3.5 3.5 pF
CO output
capacitance
4.0 4.0 pF
CPD
power dissipation CL = 50 pF;
12 15 pF
capacitance
f = 1 MHz;
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW).
PD = CPD × VCC2 × fi + (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
(CL × VCC2 × fo) = sum of outputs;
CL = output load capacitance in pF;
VCC = supply voltage in Volts.
2. The condition is VI = GND to VCC.
1999 Sep 28
2


Part Number 74AHC245
Description Octal bus transceiver; 3-state
Maker NXP
Total Page 20 Pages
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