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Part: 54AC245F
Category:
Interface and Interconnect
-> Transceivers
Description: Octal Bidirectional Transceiver With Tri-state Inputs/outputs
Company: National Semiconductor Corporation
Datasheet: Download 54AC245F datasheet File size : 232 kB
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54AC245 · 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs
August 1998
54AC245 · 54ACT245 Octal Bidirectional Transceiver with TRI-STATE ® Inputs/Outputs
General Description
The 'AC/'ACT245 contains eight non-inverting bidirectional buffers with TRI-STATE outputs and is intended for bus-oriented applications. Current sinking capability is 24 mA at both the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active-HIGH) enables data from A ports to B 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 n n n n n ICC and IOZ reduced by 50% Noninverting buffers Bidirectional data path A and B outputs source/sink 24 mA 'ACT245 has TTL-compatible inputs Standard Microcircuit Drawing (SMD) -- 'AC245: 5962-87758 -- 'ACT245: 5962-87663
Logic Symbols
IEEE/IEC
DS100283-1
DS100283-2
Pin Names OE T/R A0 A7 B0 B7
Description Output Enable Input Transmit/Receive Input Side A TRI-STATE Inputs or TRI-STATE Outputs Side B TRI-STATE Inputs or TRI-STATE Outputs
TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT ® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100283
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Connection Diagrams
Pin Assignment for DIP and Flatpak Pin Assignment for LCC
DS100283-4
Truth Table
Inputs OE
DS100283-3
Outputs T/R L H X Bus B Data to Bus A Bus A Data to Bus B HIGH-Z State
L L H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
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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. Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = -0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP -0.5V to +7.0V -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA +20 mA -0.5V to VCC + 0.5V
Recommended Operating Conditions
Supply Voltage (VCC) 'AC 'ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 54AC/ACT Minimum Input Edge Rate (V/t) 'AC Devices VIN from 30% to 70% of VCC VCC @ 3.3V, 4.5V, 5.5V Minimum Input Edge Rate (V/t) 'ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC -55°C to +125°C
125 mV/ns
± 50 mA ± 50 mA -65°C to +150°C
175°C
125 mV/ns
Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. National does not recommend operation of FACT ® circuits outside databook specifications.
DC Characteristics for 'AC Family Devices
Symbol Parameter VCC (V) 54AC TA = -55°C to +125°C Guaranteed Limits VIH Minimum High Level Input Voltage VIL Maximum Low Level Input Voltage VOH Minimum High Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 (Note 2) VIN = VIL or VIH 3.0 4.5 5.5 VOL Maximum Low Level Output Voltage 3.0 4.5 5.5 2.4 3.7 4.7 0.1 0.1 0.1 (Note 2) VIN = VIL or VIH 3.0 4.5 5.5 IIN Maximum Input Leakage Current 5.5 0.50 0.50 0.50 V µA IOL 12 mA 24 mA 24 mA VI = VCC, GND V V IOH -12 mA -24 mA -24 mA IOUT = 50 µA V IOUT = -50 µA V VOUT = 0.1V or VCC - 0.1V V VOUT = 0.1V or VCC - 0.1V Units Conditions
± 1.0
3
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DC Characteristics for 'AC Family Devices
Symbol Parameter VCC (V)
(Continued)
54AC TA = -55°C to +125°C Guaranteed Limits
Units
Conditions
IOLD IOHD ICC IOZT
(Note 3) Minimum Dynamic Output Current Maximum Quiescent Supply Current Maximum I/O Leakage Current
5.5 5.5 5.5
50 -50 80.0
mA mA µA
VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND VI(OE) = VIL, VIH VI = VCC, GND VO = VCC, GND
5.5
± 5.5
µA
Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC. ICC for 54AC @ 25°C is identical to 74AC @ 25°C.
DC Characteristics for 'ACT Family Devices
Symbol Parameter VCC (V) 54ACT TA = -55°C to +125°C Guaranteed Limits VIH VIL VOH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage 4.5 5.5 4.5 5.5 4.5 5.5 2.0 2.0 0.8 0.8 4.4 5.4 (Note 5) VIN = VIL or VIH 4.5 5.5 VOL Maximum Low Level Output Voltage 4.5 5.5 3.70 4.70 0.1 0.1 (Note 5) VIN = VIL or VIH 4.5 5.5 IIN ICCT IOLD IOHD ICC Maximum Input Leakage Current Maximum ICC/Input (Note 6) Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 5.5 5.5 50 -50 80.0 mA mA µA VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND 5.5 5.5 0.50 0.50 V µA mA IOL 24 mA 24 mA VI = VCC, GND VI = VCC - 2.1V V V IOH -24 mA -24 mA IOUT = 50 µA V V V VOUT = 0.1V or VCC - 0.1V VOUT = 0.1V or VCC - 0.1V IOUT = -50 µA Units Conditions
± 1.0
1.6
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DC Characteristics for 'ACT Family Devices
Symbol Parameter VCC (V)
(Continued)
54ACT TA = -55°C to +125°C Guaranteed Limits
Units
Conditions
IOZT
Maximum I/O Leakage Current 5.5
± 5.0
µA
VI (OE) = VIL, VIH VI = VCC, GND VO = VCC, GND
Note 5: All outputs loaded; thresholds on input associated with output under test. Note 6: Maximum test duration 2.0 ms, one output loaded at a time. Note 7: ICC for 54ACT @ 25°C is identical to 74ACT @ 25°C.
AC Electrical Characteristics
VCC Symbol Parameter (V) (Note 8) Min tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay An to Bn or Bn to An Propagation Delay An to Bn or Bn to An Output Enable Time Output Enable Time Output Disable Time Output Disable Time 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0
Note 8: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V
54AC TA = -55°C to +125°C CL = 50 pF Max 11.5 8.5 10.0 7.5 13.5 10.0 14.5 10.5 13.5 10.5 14.0 10.5 ns ns ns ns ns ns 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Units
Fig. No.
AC Electrical Characteristics
VCC Symbol Parameter (V) (Note 9) Min tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay An to Bn or Bn to An Propagation Delay An to Bn or Bn to An Output Enable Time Output Enable Time Output Disable Time Output Disable Time 5.0 5.0 5.0 5.0 1.0 1.0 1.0 1.0 12.0 13.0 12.0 12.0 ns ns ns ns 5.0 1.0 10.0 ns 5.0 1.0 54ACT TA = -55°C to +125°C CL = 50 pF Max 9.0 ns Units
Note 9: Voltage Range 5.0 is 5.0V ± 0.5V
5
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