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74AHC245 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. 74AHC245
Description  Octal bus transceiver; 3-state
Download  20 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74AHC245 Datasheet(HTML) 2 Page - NXP Semiconductors

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1999 Sep 28
2
Philips Semiconductors
Product specification
Octal bus transceiver; 3-state
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.
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf ≤ 3.0 ns.
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.
INPUTS
INPUTS/OUTPUTS
OE
DIR
An
Bn
L
L
A = B
inputs
L
H
inputs
B = A
HX
Z
Z
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
AHC
AHCT
tPHL/tPLH
propagation delay
CL =15pF;
VCC =5V
3.5
5.0
ns
An to Bn, Bn to An
CI
input capacitance
VI =VCC or GND 3.5
3.5
pF
CO
output
capacitance
4.0
4.0
pF
CPD
power dissipation
capacitance
CL =50pF;
f = 1 MHz;
notes 1 and 2
12
15
pF


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