SCBS078A − D3529, JUNE 1990 − DECEMBER 1993
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•
•
•
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DW OR N PACKAGE
(TOP VIEW)
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Output Ports Have Equivalent 33-Ω Series
Resistors, So No External Resistors Are
Required
High-Impedance State During Power-Up and
Power-Down
3-State Buffer-Type Outputs Drive Bus
Lines Directly
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (N)
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
description
The SN64BCT2244 is a noninverting octal buffer and line/MOS driver designed specifically to improve both the
performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and
transmitters. Taken together with the SN64BCT2240 and SN64BCT2241, these devices provide the choice of
selected combinations of inverting and noninverting outputs, symmetrical OE (active-low output-enable) inputs,
and complementary OE and OE inputs. These devices feature high fan-out and improved fan-in.
When the output-enable (1OE and 2OE) inputs are low, the device transmits data from the A inputs to the
Y outputs. When 1OE and 2OE are high, the outputs are in the high-impedance state. Output-enable 1OE
affects only the 1Y outputs; output-enable 2OE affects only the 2Y outputs.
The outputs, which are designed to source or sink up to 12 mA, include 33-Ω series resistors to reduce overshoot
and undershoot.
The SN64BCT2244 is characterized for operation from − 40°C to 85°C and 0°C to 70°C.
FUNCTION TABLE
(each buffer)
INPUTS
OE
A
OUTPUT
Y
H
X
Z
L
L
L
L
H
H
Copyright 1993, Texas Instruments Incorporated
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• DALLAS, TEXAS 75265
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POST OFFICE BOX 655303
POST OFFICE BOX 1443
1
SCBS078A − D3529, JUNE 1990 − DECEMBER 1993
logic symbol†
1OE
1A1
1A2
1A3
1A4
1
logic diagram (positive logic)
1
1OE
EN
2
1
18
4
16
6
14
8
12
1A1
1Y1
2OE
18
4
16
1Y3
1A2
2A2
2A3
2A4
1Y2
1Y4
6
14
1Y3
EN
8
2A1
1Y1
1Y2
1A3
19
2
11
1
9
13
7
15
5
17
3
12
1A4
1Y4
2Y1
2Y2
19
2Y3
2OE
2Y4
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
2A1
2A2
11
9
13
7
15
5
17
3
2Y1
2Y2
schematic of Y outputs
2A3
VCC
2A4
Output
GND
2
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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2Y3
2Y4
SCBS078A − D3529, JUNE 1990 − DECEMBER 1993
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V
Voltage range applied to any output in the disabled or power-off state, VO . . . . . . . . . . . . . . . . −0.5 V to 5.5 V
Voltage range applied to any output in the high state, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 mA
Current into any output in the low state, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 mA
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40°C to 85°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
recommended operating conditions (see Note 2)
MIN
NOM
MAX
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
0.8
V
Input clamp current
−18
mA
IOH
IOL
High-level output current
−12
mA
Low-level output current
12
∆t /∆VCC
Power-up ramp rate
High-level input voltage
2
V
mA
µs / V
2
TA
Operating free-air temperature
NOTE 2: Unused or floating inputs must be held high or low.
V
−40
85
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
TEST CONDITIONS
VCC = 4.5 V,
II = −18 mA
IOH = − 1 mA
VOH
VCC = 4.5 V
VOL
VCC = 4.5 V
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
IIL
VCC = 5.5 V,
VCC = 0 to 2.3 V (power up)
IOZ
IOZH
IOZL
IOS§
IOH = − 12 mA
IOL = 1 mA
ICCL
ICCH
VCC = 5.5 V,
VCC = 5.5 V,
ICCZ
Ci
VCC = 5.5 V,
VCC = 5 V,
TYP‡
2.4
3.3
2
3.1
IOL = 12 mA
VI = 7 V
VCC = 1.8 to 0 V (power down)
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
MIN
UNIT
−1.2
V
V
0.15
0.5
0.35
0.8
0.1
VI = 2.7 V
VI = 0.5 V
VO = 2.7 or 0.5 V,
MAX
VO = 0
Outputs open
µA
−1
mA
± 50
VO = 2.7 V
VO = 0.5 V
50
−100
mA
20
± 50
OE = 0.8 V
V
µA
A
µA
−50
µA
−225
mA
53
77
mA
Outputs open
23
37
mA
Outputs open
4
10
mA
VI = VCC or GND
VCC = 5 V,
VO = VCC or GND
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
Co
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6
pF
11
pF
3
SCBS078A − D3529, JUNE 1990 − DECEMBER 1993
switching characteristics over recommended range of supply voltage, CL = 50 pF (unless
otherwise noted) (see Note 3)
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A
Y
tPZH
tPZL
OE
Y
tPHZ
tPLZ
OE
Y
PARAMETER
TA = − 40°C
to 85°C
VCC = 5 V,
TA = 25°C
MIN
TYP
MAX
MIN
MAX
MIN
MAX
0.5
3
4.4
0.5
5.2
0.5
4.9
1.6
4.6
6.3
1.6
7.1
1.6
6.7
2.4
6.1
7.7
2.4
9.1
2.4
8.7
3.9
7.6
9.4
3.9
10.8
3.9
10.4
1.7
5.2
6.9
1.7
8.1
1.7
7.8
2.8
6.5
8.3
2.8
10.9
2.8
9.8
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
4
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POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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TA = 0°C
to 70°C
UNIT
ns
ns
ns
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