Phillips
Phillips
Phillips
74F245
Octal transceiver (3-State)
Philips Semiconductors
Philips Semiconductors Product specification
conditions A3 5 16 B2
A4 6 15 B3
DESCRIPTION A5 7 14 B4
The 74F245 is an octal transceiver featuring non-inverting 3-State
A6 8 13 B5
bus compatible outputs in both transmit and receive directions. The
B port outputs are capable of sinking 64mA and sourcing 15mA, A7 9 12 B6
producing very good capacitive drive characteristics. The device GND 10 11 B7
features an Output Enable (OE) input for easy cascading and
Transmit/Receive (T/R) input for direction control. The 3-State SF00198
outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
ORDERING INFORMATION
COMMERCIAL RANGE
DESCRIPTION DRAWING NUMBER
VCC = 5V ±10%, Tamb = 0°C to +70°C
20-Pin Plastic DIP N74F245N SOT146-1
20-Pin Plastic SO N74F245D SOT163-1
20-Pin Plastic SSOP Type II N74F245DB SOT339-1
∇1
A0 A1 A2 A3 A4 A5 A6 A7 2 18
2∇
19 OE 3 17
1 T/R 4 16
B0 B1 B2 B3 B4 B5 B6 B7 5 15
6 14
7 13
18 17 16 15 14 13 12 11 8 12
9 11
VCC = Pin 20
GND = Pin 10
SF00199 SF00200
LOGIC DIAGRAM
A0 A1 A2 A3 A4 A5 A6 A7
2 3 4 5 6 7 8 9
19
OE
1
T/R
18 17 16 15 14 13 12 11
VCC = Pin 20 B0 B1 B2 B3 B4 B5 B6 B7
GND = Pin 10
SF00201
FUNCTION TABLE
INPUTS
OUTPUTS
OE T/R
L L Bus B data to Bus A
L H Bus A data to Bus B
H X Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
SYMBOL PARAMETER TEST CONDITIONS1 UNIT
MIN TYP2 MAX
±10% VCC 2.4 V
A0 A7 B0–B7
A0–A7, B0 B7 IOH
O = –3mA
3mA
VCC = MIN, ±5% VCC 2.7 3.4 V
VOH
O High level output voltage
High-level VIL = MAX
MAX,
VIH = MIN ±10% VCC 2.0 V
B0 B7
B0–B7 IOH
O = –15mA
15mA
±5% VCC 2.0 V
IOL = 20mA ±10% VCC 0.30 0.50 V
A0 A7
A0–A7 VCC = MIN,
MIN
VOL Low-level output voltage VIL = MAX, IOL = 24mA ±5% VCC 0.35 0.50 V
VIH = MIN
B0–B7 IOL = MAX ±10% VCC 0.55 V
VCC = MIN,
VOL Low-level output voltage B0–B7 VIL = MAX, IOL = MAX ±5% VCC 0.42 0.55 V
VIH = MIN
VIK Input clamp voltage VCC = MIN, II = IIK –0.73 –1.2 V
AC ELECTRICAL CHARACTERISTICS
LIMITS
VCC = +5.0V VCC = +5.0V ± 10%
TEST
SYMBOL PARAMETER Tamb = +25°C Tamb = 0°C to +70°C UNIT
CONDITION
CL = 50pF, RL = 500Ω CL = 50pF, RL = 500Ω
MIN TYP MAX MIN MAX
tPLH Propagation delay 2.5 3.5 6.0 2.5 7.0
Waveform 1 ns
tPHL An to Bn, Bn to An 2.5 4.0 6.0 2.5 7.0
tPZH Output Enable time Waveform 2 2.0 4.5 7.0 2.0 8.0
ns
tPZL to High or Low level Waveform 3 3.5 5.5 8.0 3.5 9.0
tPHZ Output Disable time Waveform 2 2.5 5.0 6.5 2.0 7.5
ns
tPLZ from High or Low level Waveform 3 1.0 3.5 6.0 1.0 7.0
AC WAVEFORMS
For all waveforms, VM = 1.5V.
An, Bn
VM VM
tPLH tPHL
VM VM
Bn, An
SF00202
OE OE
VM VM VM VM
An, Bn
VOH–0.3V
VM VM
An, Bn VOL+0.3V
0V
SF00203 SF00204
Waveform 2. 3-State Output Enable Time to High Level and Waveform 3. 3-State Output Enable Time to Low Level and
Output Disable Time from High Level Output Disable Time from Low Level
VCC
tw AMP (V)
7.0V 90% 90%
NEGATIVE
RL VM VM
VIN VOUT PULSE
PULSE D.U.T. 10% 10%
0V
GENERATOR
tTHL (tf ) tTLH (tr )
RT CL RL
tTLH (tr ) tTHL (tf )
AMP (V)
90% 90%
POSITIVE
Test Circuit for Open Collector Outputs PULSE VM VM
10% 10%
tw 0V
SWITCH POSITION
TEST SWITCH
tPLZ closed Input Pulse Definition
tPZL closed
All other open
DEFINITIONS:
RL = Load resistor;
see AC electrical characteristics for value. INPUT PULSE REQUIREMENTS
CL = Load capacitance includes jig and probe capacitance; family
see AC electrical characteristics for value. amplitude VM rep. rate tw tTLH tTHL
RT = Termination resistance should be equal to ZOUT of 2.5ns 2.5ns
74F 3.0V 1.5V 1MHz 500ns
pulse generators.
SF00128
1994 Nov 15 6
Philips Semiconductors Product specification
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1994 Nov 15 7
Philips Semiconductors Product specification
NOTES
1994 Nov 15 8
Philips Semiconductors Product specification
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1
1994 Nov 15 9
Philips Semiconductors Product specification
DEFINITIONS
Data Sheet Identification Product Status Definition
This data sheet contains the design target or goal specifications for product development. Specifications
Objective Specification Formative or in Design
may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Preliminary Specification Preproduction Product Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
Product Specification Full Production
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
Philips Semiconductors Philips Semiconductors and Philips Electronics North America Corporation
811 East Arques Avenue register eligible circuits under the Semiconductor Chip Protection Act.
P.O. Box 3409 Copyright Philips Electronics North America Corporation 1996
Sunnyvale, California 94088–3409 All rights reserved. Printed in U.S.A.
Telephone 800-234-7381
(print code) Date of release: July 1994
Document order number: 9397-750-05104