SN54ABT245J [TI]
ABT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, CDIP20, CERAMIC, DIP-20;
| 型号： | SN54ABT245J |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | ABT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, CDIP20, CERAMIC, DIP-20 CD 信息通信管理 输出元件 逻辑集成电路 |
| 文件： | 总12页 (文件大小：298K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
54ABT245
54ABT245 Octal Bidirectional Transceiver with TRI-STATE Outputs
Literature Number: SNOS042
July 1998
54ABT245
Octal Bidirectional Transceiver with TRI-STATE® Outputs
n Guaranteed output skew
General Description
n Guaranteed multiple output switching specifications
The ’ABT245 contains eight non-inverting bidirectional buff-
n Output switching specified for both 50 pF and 250 pF
ers with TRI-STATE outputs and is intended for bus-oriented
loads
applications. Current sinking capability is 48 mA on both the
A and B ports. The Transmit/Receive (T/R) input determines
the direction of data flow through the bidirectional trans-
ceiver. Transmit (active HIGH) enables data from A ports to B
n Guaranteed simultaneous switching, noise level and
dynamic threshold performance
n Guaranteed latchup protection
n High impedance glitch-free bus loading during entire
power up and power down cycle
n Non-destructive hot insertion capability
n Disable time is less than enable time to avoid bus
contention
ports; Receive (active LOW) enables data from B ports to A
ports. The Output Enable input, when HIGH, disables both A
and B ports by placing them in a High Z condition.
Features
n Bidirectional non-inverting buffers
n A and B output sink capability of 48 mA, source
capability of 24 mA
n Standard Microcircuit Drawing (SMD) 5962-9214801
Ordering Code:
Military
Package
Number
J20A
Package Description
54ABT245J-QML
54ABT245W-QML
54ABT245E-QML
20-Lead Ceramic Dual-In-Line
20-Lead Cerpak
W20A
E20A
20-Lead Ceramic Leadless Chip Carrier, Type C
Logic Symbol
DS100204-1
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100204
www.national.com
Connection Diagrams
Pin Assignment for DIP
and Flatpak.
Pin Assignment for LCC
DS100204-3
Pin Descriptions
DS100204-5
Pin Names
OE
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
T/R
A0–A7
B0–B7
Side A Inputs or TRI-STATE Outputs
Side B Inputs or TRI-STATE Outputs
Truth Table
Inputs
Output
OE
L
T/R
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
L
H
=
=
=
H
L
X
HIGH Voltage Level
LOW Voltage Level
Immaterial
Logic Diagram
DS100204-4
www.national.com
2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
in LOW State (Max)
twice the rated IOL (mA)
DC Latchup Source Current
Over Voltage Latchup (I/O)
−500 mA
10V
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
Ceramic
−65˚C to +150˚C
−55˚C to +125˚C
−55˚C to +175˚C
−55˚C to +125˚C
VCC Pin Potential to
Ground Pin
Supply Voltage
Military
−0.5V to +7.0V
−0.5V to +7.0V
+4.5V to +5.5V
(∆V/∆t)
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Any Output
in the Disabled or
Minimum Input Edge Rate
Data Input
−30 mA to +5.0 mA
50 mV/ns
Enable Input
20 mV/ns
Note 1: Absolute maximum ratings are values beyond which the device may
be damaged or have its useful life impaired. Functional operation under these
conditions is not implied.
Power-off State
−0.5V to 5.5V
−0.5V to VCC
in the HIGH State
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
Current Applied to Output
DC Electrical Characteristics
Symbol
Parameter
ABT245
Conditions
Units
VCC
Min Typ Max
VIH
Input HIGH Voltage
2.0
V
V
V
V
V
Recognized HIGH Signal
Recognized LOW Signal
VIL
Input LOW Voltage
0.8
=
IIN −18 mA (OE, T/R)
VCD
VOH
Input Clamp Diode Voltage
−1.2
Min
Min
Min
=
IOH −3 mA (An, Bn)
Output HIGH
Voltage
54ABT
54ABT
54ABT
2.5
=
IOH −24 mA (An, Bn)
2.0
=
IOL 48 mA (An, Bn)
VOL
IIH
Output LOW
Voltage
0.55
V
Min
=
VIN 2.7V (OE, T/R) (Note 3)
Input HIGH Current
5
5
µA
µA
µA
Max
Max
Max
=
VIN VCC (OE, T/R)
=
VIN 7.0V (OE, T/R)
IBVI
Input HIGH Current Breakdown Test
7
=
VIN 5.5V (An, Bn)
IBVIT
Input HIGH Current Breakdown Test
(I/O)
100
=
VIN 0.5V (OE, T/R) (Note 3)
IIL
Input LOW Current
−5
µA
V
Max
0.0
=
VIN 0.0V (OE, T/R)
−5
=
VID
Input Leakage Test
4.75
IID 1.9 µA (OE, T/R)
All Other Pins Grounded
= =
0 − 5.5V VOUT 2.7V (An, Bn); OE 2.0V
IIH + I
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Output High Leakage Current
Bus Drainage Test
50
µA
µA
mA
µA
OZH
= =
0 − 5.5V VOUT 0.5V (An, Bn); OE 2.0V
IIL + IOZL
IOS
−50
=
VOUT 0.0V (An, Bn)
−100
−275
50
Max
Max
=
VOUT VCC (An, Bn)
ICEX
=
IZZ
100
VOUT 5.5V (An, Bn);
µA
0.0
All Others GND
All Outputs HIGH
All Outputs LOW
ICCH
ICCL
ICCZ
Power Supply Current
Power Supply Current
Power Supply Current
50
30
50
µA
Max
Max
mA
=
=
OE VCC, T/R GND or VCC
;
µA
Max
All Other GND or VCC
=
VI VCC − 2.1V
ICCT
Additional
CC/Input
Outputs Enabled
2.5
2.5
50
mA
mA
µA
=
OE, T/R VI VCC − 2.1V
I
Outputs TRI-STATE
Outputs TRI-STATE
Max
=
Data Input VI VCC − 2.1V
All Others at VCCor GND.
3
www.national.com
DC Electrical Characteristics (Continued)
Symbol
Parameter
ABT245
Min Typ Max
0.1
Conditions
Units
VCC
ICCD
Dynamic ICC
(Note 3)
No Load
mA/
MHz
Outputs Open
=
=
Max
OE GND, T/R GND or VCC
One Bit Toggling, 50% Duty Cycle
(Note 4)
Note 3: Guaranteed but not tested.
<
Note 4: For 8 bits toggling, I
CCD
0.8 mA/MHz.
DC Electrical Characteristics
Conditions
=
CL 50 pF,
Symbol
Parameter
Min
Max
Units
VCC
=
RL 500Ω
=
TA 25˚C (Note 5)
VOLP
VOLV
Quiet Output Maximum Dynamic VOL
Quiet Output Minimum Dynamic VOL
1.1
V
V
5.0
5.0
=
-0.45
TA 25˚C(Note 5)
Note 5: Max number of outputs defined as (n). n − 1 data inputs are driven 0V to 3V. One output at LOW.
AC Electrical Characteristics
Symbol
Parameter
54ABT
TA −55˚C to +125˚C
Units
=
=
VCC 4.5V–5.5V
=
CL 50 pF
Min
1.0
1.0
1.0
2.0
1.7
1.7
Max
4.8
4.8
6.7
7.5
7.4
6.5
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Propagation Delay
Data to Outputs
Output Enable
Time
ns
ns
ns
Output Disable
Time
Capacitance
Symbol
Parameter
Typ
Units
Conditions
=
TA 25˚C
VCC 0V (OE , T/R)
=
CIN
CI/O (Note 6)
Input Capacitance
I/O Capacitance
5.0
pF
pF
=
VCC 5.0V (An, Bn)
11.0
=
C is measured at frequency f 1 MHz, per MIL-STD-883B, Method 3012.
I/O
Note 6:
www.national.com
4
Capacitance (Continued)
tPLH vs Temperature (TA)
tPHL vs Temperature (TA)
=
CL 50 pF, 1 Output Switching
=
CL 50 pF, 1 Output Switching
DS100204-14
DS100204-15
tPLH vs Load Capacitance
tPHL vs Load Capacitance
=
=
1 Output Switching, TA 25˚C
1 Output Switching, TA 25˚C
DS100204-16
DS100204-17
Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table.
tPLH vs Load Capacitance
tPHL vs Load Capacitance
=
=
8 Outputs Switching, TA −40˚C to +85˚C
8 Outputs Switching, TA 25˚C
DS100204-18
DS100204-19
5
www.national.com
Capacitance (Continued)
tPZL vs Temperature (TA)
tPLZ vs Temperature (TA)
=
CL 50 pF, 1 Output Switching
=
CL 50 pF, 1 Output Switching
DS100204-20
DS100204-21
tPZL vs Temperature (TA)
tPLZ vs Temperature (TA)
=
CL 50 pF, 8 Outputs Switching
=
CL 50 pF, 8 Outputs Switching
DS100204-22
DS100204-23
Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table.
tPZH vs Temperature (TA)
tPHZ vs Temperature (TA)
=
CL 50 pF, 1 Output Switching
=
CL 50 pF, 1 Output Switching
DS100204-24
DS100204-25
www.national.com
6
Capacitance (Continued)
tPZH vs Temperature (TA)
tPHZ vs Temperature (TA)
=
CL 50 pF, 8 Outputs Switching
=
CL 50 pF, 8 Outputs Switching
DS100204-26
DS100204-27
tPZH vs Load Capacitance
tPZL vs Load Capacitance
=
8 Outputs Switching, TA 25˚C
=
8 Outputs Switching, TA 25˚C
DS100204-28
DS100204-29
Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table.
tPLH and tPHL vs Number Outputs Switching
=
ICC vs Frequency, Average, TA 25˚C,
=
=
=
VCC 5.0V, TA 25˚C, CL 50 pF
All Outputs Unloaded/Unterminated
DS100204-30
DS100204-31
Dashed lines represent design characteristics; for specified guarantees, refer to AC Characteristics Table.
7
www.national.com
AC Loading
DS100204-6
DS100204-7
*
Includes jig and probe capacitance
FIGURE 2. Test Input Signal Levels
FIGURE 1. Standard AC Test Load
Amplitude Rep. Rate
3.0V 1 MHz
tw
tr
tf
500 ns
2.5 ns
2.5 ns
FIGURE 3. Test Input Signal Requirements
AC Waveforms
DS100204-8
DS100204-10
FIGURE 4. Propagation Delay Waveforms
for Inverting and Non-Inverting Functions
FIGURE 5. TRI-STATE Output HIGH
and LOW Enable and Disable Times
www.national.com
8
Physical Dimensions inches (millimeters) unless otherwise noted
20-Terminal Ceramic Chip Carrier (L)
NS Package Number E20A
20-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
9
www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Ceramic Flatpak (F)
NS Package Number W20A
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