Page 1
INTEGRATED CIRCUITS
74F244/74F244B
Octal buffers (3-State)
Product specification 1994 Dec 05
IC15 Data Handbook
Philips Semiconductors
Page 2
Philips Semiconductors Product specification
PKG DWG #
74F244/74F244BOctal buffers (3-State)
FEA TURES
•Octal bus interface
• 3-State output buffer sink 64mA
•15mA source current
•Guaranteed output skew less than 2.0ns (74F244B)
•Reduced ground bounce (74F244B)
•Reduced I
•Reduced loading (74F244B I
(74F244B)
CC
= 40µA)
IL
•Split lead frame offers increased noise immunity (74F244B)
•Industrial temperature range available (-40°C to +85°C) for
74F244
DESCRIPTION
The 74F244 is an octal buffer that is ideal for driving bus lines of
buffer memory address registers. The outputs are all capable of
sinking 64mA and sourcing up to 15mA, producing very good
capacitive drive characteristics. The device features two output
enables, OE
The 74F244B is functionally equivalent to the 74F244. It has been
designed to reduce effects of ground noise. Other advantages are
noted in the features.
a and OEb, each controlling four of the 3-State outputs.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPL Y
CURRENT (TOTAL)
74F244 4.0ns 53mA
74F244B 4.0ns 33mA
•74F244 available in SSOP Type II package
ORDERING INFORMATION
ORDER CODE
COMMERCIAL RANGE INDUSTRIAL RANGE
DESCRIPTION
20-pin plastic DIP N74F244N, N74F244BN I74F244N SOT146-1
20-pin plastic SOL N74F244D, N74F244BD I74F244D SOT163-1
20-pin plastic SSOP II N74F244DB SOT339-1
VCC = 5V ±10%, VCC = 5V ±10%,
T
= 0°C to +70°C T
amb
= -40°C to +85°C
amb
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS DESCRIPTION
Ian, Ibn Data inputs (74F244) 1.0/2.67 20µA/1.6mA
Data inputs (74F244B) 1.0/0.067 20µA/40µA
OEa, OEb Output enable inputs (active low) (74F244) 1.0/1.67 20µA/1.0mA
Output enable inputs (active low) (74F244B) 1.0/0.067 20µA/40µA
Yan, Ybn Data outputs 750/106.7 15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
PIN CONFIGURATION
1
OEa
2
Ia0
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
Yb3
10 11
GND
20
V
19
OEb
18
Ya0
17
Ib0
16
Ya1
15
Ib1
14
Ya2
13
Ib2
12
Ya3
Ib3
SF00227
CC
LOGIC SYMBOL
1
= Pin 20
V
CC
GND = Pin 10
74F (U.L.)
HIGH/LOW
2 4 6 8 17 15 13 11
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
OEa
OEb19
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
18 16 14 12 3 5 7 9
LOAD VALUE
HIGH/LOW
SF00228
1994 Dec 5 853-0357 14381
2
Page 3
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
IEC/IEEE SYMBOL
1
19
2
4
6
8
17
15
13
11
LOGIC DIAGRAM
2
Ia0
4
Ia1
6
Ia2
FUNCTION TABLE
EN1
EN2
2D
OEa Ia OEb Ib Ya Yb
L L L L L L
SF00229
18
16
14
12
3
5
7
9
L H L H H H
H X H X Z Z
NOTES:
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance ”off” state
1
2
INPUTS OUTPUTS
18
Ya0
16
Ya1
14
Ya2
Ib0
Ib1
Ib2
17
15
13
3
Yb0
5
Yb1
7
Yb2
Ia3
OEa
V
= Pin 20
CC
GND = Pin 10
8
1
12
Ya3
Ib3
OEb
11
19
9
SF00230
Yb3
1994 Dec 5
3
Page 4
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
74F244/74F244BOctal buffers (3-State)
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
V
V
I
IN
V
I
OUT
T
T
CC
IN
OUT
amb
stg
Supply voltage -0.5 to +7.0 V
Input voltage -0.5 to +7.0 V
Input current -30 to +5 mA
Voltage applied to output in high output state -0.5 to V
Current applied to output in low output state 128 mA
Operating free air temperature range
Storage temperature range -65 to +150
RECOMMENDED OPERATING CONDITIONS
V
V
V
I
I
i
T
CC
IN
IL
IK
OH
ol
amb
Supply voltage 4.5 5.0 5.5 V
High-level input voltage 2.0 V
Low-level input voltage 0.8 V
Input clamp current –18 mA
High-level output current –15 mA
Low-level output current 64 mA
Operating free air temperature range
PARAMETER RATING UNIT
V
°C
°C
Commercial range 0 to +70
Industrial range
(74F244 only)
-40 to +85
CC
°C
LIMITS
MIN NOM MAX
Commercial range 0 +70
Industrial range
(74F244 only)
–40 +85
°C
°C
1994 Dec 5
4
Page 5
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
3
74F244/74F244BOctal buffers (3-State)
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
TEST
CONDITIONS
VCC = MIN, IOH = -3mA
V
OH
High-level output voltage
VIL = MAX,
VIH = MIN IOH = -15mA
V
OL
Low-level output voltage
VCC = MIN,
VIL = MAX,
IOL = MAX ±10%V
VIH = MIN, ±5%V
V
IK
I
I
I
IH
Input clamp voltage VCC = MIN, II = I
IK
Input current at maximum input voltage VCC = MAX, VI = 7.0V 100 µA
High-level input current VCC = MAX, VI = 2.7V 20 µA
1
±10%V
±5%V
±10%V
±5%V
CC
CC
CC
CC
CC
CC
74F244 OEa, OEb -1.0 mA
I
IL
Low-level input current 74F244 Ian, Ibn VCC = MAX, VI = 0.5V -1.6 mA
74F244B all inputs -40 µA
I
OZH
I
OZL
I
OS
I
CC
Off-state output current,
high-level voltage applied
Off-state output current,
low-level voltage applied
Short-circuit output current
74F244 I
Supply current (total) I
74F244B I
VCC = MAX, V
VCC = MAX, VO = 0.5V -50
VCC = MAX -100 -225 mA
I
CCH
CCLVCC
CCZ
I
CCH
CCLVCC
I
CCZ
= MAX 60 90 mA
= MAX 50 70 mA
= 2.7V 50
O
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold
= 5V, T
CC
amb
= 25°C.
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, IOS tests should be performed last.
LIMITS
MIN TYP2MAX
2.5 V
2.7 3.4 V
2.0 V
2.0 V
0.55 V
0.42 0.55 V
-0.73 -1.2 V
µA
µA
40 60 mA
60 90 mA
20 30 mA
29 40 mA
1994 Dec 5
5
Page 6
Philips Semiconductors Product specification
1
2
74F244/74F244BOctal buffers (3-State)
AC ELECTRICAL CHARACTERISTICS FOR 74F244
A PORT LIMITS
T
= +25°C T
amb
SYMBOL PARAMETER TEST VCC = +5.0V
CONDITION CL = 50pF,
RL = 500Ω
MIN TYP MAX MIN MAX MIN MAX
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
Ian, Ibn to Yn
Output enable time
to high or low
Output disable time
from high or low
Waveform 1
Waveform 2
Waveform 4
Waveform 2
Waveform 4
2.5
2.5
2.0
2.0
1.5
1.5
4.0
4.0
4.3
5.0
2.5
2.5
5.2
5.2
5.7
7.0
5.5
5.5
AC ELECTRICAL CHARACTERISTICS FOR 74F244B
SYMBOL PARAMETER TEST VCC = +5.0V
CONDITION CL = 50pF, RL = 500Ω CL = 50pF, RL = 500Ω
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
sk(0)
NOTES:
1. |t
PN
2. Skew times are valid only under same test conditions (temperature, V
Propagation delay
Ian, Ibn to Yn
Output enable time
to high or low level
Output disable time
from high or low level
,
Output skew
Waveform 1
Waveform 2
Waveform 4
Waveform 2
Waveform 4
Waveform 3
actual - tPM actual| for any output compared to any other output where N and M are either LH or HL.
, loading, etc.,).
CC
= 0°C to +70°C T
amb
= -40°C to +85°C
amb
VCC = +5.0V ± 10% VCC = +5.0V ± 10%
CL = 50pF,
RL = 500Ω
2.0
2.0
2.0
2.0
1.0
1.0
6.2
6.5
6.7
8.0
6.0
5.5
CL = 50pF,
RL = 500Ω
1.5
2.0
2.0
2.0
1.0
1.0
7.0
7.0
8.0
8.5
6.0
5.5
LIMITS
T
= +25°C T
amb
= 0°C to +70°C
amb
VCC = +5.0V ± 10%
MIN TYP MAX MIN MAX
2.5
2.5
2.0
3.0
1.5
1.5
4.5
4.5
4.0
5.5
2.5
2.5
5.7
6.0
6.0
7.5
5.5
5.5
2.0
2.5
2.0
3.0
1.0
1.0
6.2
6.5
6.5
8.0
6.0
5.5
1.5 2.0
UNIT
ns
ns
ns
UNIT
ns
ns
ns
ns
1994 Dec 5
6
Page 7
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Ian, Ibn
Yn
V
M
t
PLH
V
M
t
PHL
V
M
Waveform 1. Propagation Delay for data to outputs
OEn
V
M
t
PZH
Yn
V
M
t
PHZ
V
M
Waveform 2. 3-State output enable time to high level
and output disable time from high level
TEST CIRCUIT AND WAVEFORMS
SWITCH POSITION
TEST SWITCH
, t
t
PLZ
PZL
closed
openAll other
V
PULSE
GENERATOR
IN
Test circuit for 3-State outputs
DEFINITIONS:
R
= Load resistor; see AC electrical characteristics for
L
value.
CL= Load capacitance includes jig and probe
capacitance; see AC electrical characteristics for
value
R
= T ermination resistance should be equal to Z
T
pulse generators.
V
CC
V
D.U.T.
R
T
OUT
C
L
R
R
L
L
OUT
V
M
SF00231
VOH–0.3V
SF00233
of
7.0V
0V
NEGATIVE
PULSE
POSITIVE
PULSE
family
74F
Yn, Yn
Yn, Yn
V
M
t
(0)
sk
V
M
SF00232
Waveform 3. Output skew
OEn
Yn
V
M
t
PZL
V
M
t
PLZ
V
M
Waveform 4. 3-State output enable time to low level
and output disable time from low level
t
90%
10%
V
M
10%
t
THL (tf
t
TLH (tr
90%
V
M
w
10%
)
)
t
)
TLH (tr
t
)
THL (tf
90%
t
w
90%
V
M
V
M
10%
Input pulse definition
INPUT PULSE REQUIREMENTS
amplitude
3.0V
V
1.5V
rep. rate
M
1MHz 500ns 2.5ns
t
w
t
TLHtTHL
3.5V
VOL+0.3V
SF00234
AMP (V)
0V
AMP (V)
0V
2.5ns
SF000235
1994 Dec 5
7
Page 8
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
1994 Dec 05
8
Page 9
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1994 Dec 05
9
Page 10
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1
1994 Dec 05
10
Page 11
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
NOTES
1994 Dec 05
11
Page 12
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
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.
LIFE SUPPORT APPLICA TIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
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
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation
register eligible circuits under the Semiconductor Chip Protection Act.
Copyright Philips Electronics North America Corporation 1996
All rights reserved. Printed in U.S.A.
(print code) Date of release: October 28, 1991
Document order number: 9397-750-05103
9397-750-05103
Loading...