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Part: 74AC245
Category:
Logic
-> Bus Interface
-> Bus Oriented Circuits
Description: Octal Bidirectional Transceiver With 3-STATE Inputs/ Outputs
Company: Fairchild Semiconductor
Datasheet: Download 74AC245 datasheet File size : 232 kB
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Datasheet text preview:
74AC245 · 74ACT245 Octal Bidirectional Transceiver with 3-STATE
November 1988 Revised November 1999
74AC245 · 74ACT245 Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs
General Description
The AC/ACT245 contains eight non-inverting bidirectional buffers with 3-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
s ICC and IOZ reduced by 50% s Noninverting buffers s Bidirectional data path s A and B outputs source/sink 24 mA s ACT245 has TTL-compatible inputs
Ordering Code:
Order Number 74AC245SC 74AC245SJ 74AC245MTC 74AC245PC 74ACT245SC 74ACT245SJ 74ACT245MSA 74ACT245MTC 74ACT245PC Package Number M20B M20D MTC20 N20A M20B M20D MSA20 MTC20 N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Body 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Body 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
FACT is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation
DS009944
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74AC245 · 74ACT245
Connection Diagram
Pin Descriptions
Pin Description Names OE T/R A0A7 B0B7 Output Enable Input Transmit/Receive Input Side A 3-STATE Inputs or 3-STATE Outputs Side B 3-STATE Inputs or 3-STATE Outputs
Truth Table
Inputs
Logic Symbols
Outputs OE L L H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
T/R L H X Bus B Data to Bus A Bus A Data to Bus B HIGH-Z State
IEEE/IEC
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2
74AC245 · 74ACT245
Absolute Maximum Ratings(Note 1)
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) PDIP 140°C ±50 mA -65°C to +150°C ±50 mA -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA +20 mA -0.5V to VCC + 0.5V -0.5V to +7.0V
Recommended Operating Conditions
Supply Voltage (VCC) AC ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 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 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. Fairchild does not recommend operation of FACT circuits outside databook specifications.
2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC -40°C to +85°C
125 mV/ns
DC Electrical Characteristics for AC
Symbol VIH Parameter Minimum HIGH Level Input Voltage VIL Maximum LOW Level Input Voltage VOH Minimum HIGH Level Output Voltage VCC (V) 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 VOL Maximum LOW Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 IIN (Note 4) IOLD IOHD IOZT Maximum Input Leakage Current Dynamic Output Current Minimum (Note 3) Maximum I/O Leakage Current 5.5 ± 0.3 ± 3.0 µA 5.5 5.5 5.5 5.5 4.0 0.002 0.001 0.001 TA = +25°C Typ 1 .5 2.25 2.75 1 .5 2.25 2.75 2.99 4.49 5.49 2.1 3 .15 3 .85 0.9 1 .35 1 .65 2.9 4 .4 5 .4 2 .56 3 .86 4 .86 0.1 0.1 0.1 0 .36 0 .36 0 .36 ± 0.1 TA = -40°C to +85°C Guaranteed Limits 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 VIN = VIL or VIH 2.46 3.76 4.76 0.1 0.1 0.1 VIN = VIL or VIH 0.44 0.44 0.44 ± 1.0 75 -75 40.0 µA mA mA µA V IOL = 12 mA IOL = 24 mA IOL = 24 mA (Note 2) VI = VCC, GND VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND VI (OE) = VIL, VIH VI = VCC, GND VO = VCC, GND
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.
Units
Conditions VOUT = 0.1V
V
or VCC - 0.1V VOUT = 0.1V
V
or VCC - 0.1V
V
IOUT = -50 µA
IOH = -12 mA V IOH = -24 mA IOH = -24 mA (Note 2) V IOUT = 50 µA
ICC (Note 4) Maximum Quiescent Supply Current
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74AC245 · 74ACT245
DC Characteristics for ACT
Symbol VIH VIL VOH Parameter Minimum HIGH Level Input Voltage Maximum LOW Level Input Voltage Minimum HIGH Level Output Voltage VCC (V) 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Maximum LOW Level Output Voltage 4.5 5.5 4.5 5.5 IIN ICCT IOLD IOHD ICC IOZT Maximum Input Leakage Current Maximum ICC/Input Dynamic Output Current Minimum (Note 6) Maximum Quiescent Supply Current Maximum I/O Leakage Current 5.5 ±0.3 ±3.0 µA 5.5 5.5 5.5 5.5 5.5 4.0 0 .6 0.001 0 .001 TA = +25°C Typ 1 .5 1 .5 1 .5 1 .5 4 .49 5 .49 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 ±0.1 TA = -40°C to +85°C Guaranteed Limits 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 ±1.0 1.5 75 -75 40.0 V V Units V V V Conditions VOUT = 0.1V or VCC - 0.1V VOUT = 0.1V or VCC - 0.1V IOUT = -50 µA VIN = VIL or VIH IOH = -24 mA IOH = -24 mA (Note 5) IOUT = 50 µA VIN = VIL or VIH V µA mA mA mA µA IOL = 24 mA IOL = 24 mA (Note 5) VI = VCC, GND VI = VCC - 2.1V VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND VI (OE) = V IL, 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.
AC Electrical Characteristics for AC
VCC Symbol Parameter (V) (Note 7) tPLH tP H L tPZH tPZL tP H Z 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 7: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V
TA = +25°C CL = 50 pF Min 1.5 1 .5 1.5 1 .5 2.5 1 .5 2 .5 1 .5 2 .0 1 .5 2.0 1 .5 Typ 5.0 3.5 5.0 3.5 7.0 5.0 7.5 5.5 6.5 5.5 7.0 5.5 Max 8.5 6.5 8.5 6.0 11.5 8.5 12.0 9.0 12.0 9.0 11.5 9.0
TA = -40°C to +85°C CL = 50 pF Min 1.0 1.0 1.0 1.0 2.0 1.0 2 .0 1.0 1 .0 1.0 1.5 1.0 Max 9.0 7 .0 9.0 7 .0 12.5 9 .0 13.5 9 .5 12.5 10.0 13.0 10.0 ns ns ns ns ns ns Units
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74AC245 · 74ACT245
AC Electrical Characteristics for ACT
V CC Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter 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 (V) (Note 8) 5.0 5.0 5.0 5.0 5.0 5.0 Min 1.5 1.5 1.5 1.5 1.5 2.0 TA = +25°C CL = 50 pF Typ 4.0 4.0 5.0 5.5 5.5 5.0 Max 7 .5 8 .0 10.0 10.0 10.0 10.0 TA = -40°C to +85°C CL = 50 pF Min 1.5 1.0 1.5 1.5 1.0 1.5 Max 8 .0 9 .0 11.0 12.0 11.0 11.0 ns ns ns ns ns ns Units
Note 8: Voltage Range 5.0 is 5.0V ± 0.5V
Capacitance
Symbol CIN CI/O CPD Parameter Input Capacitance Input/Output Capacitance Power Dissipation Capacitance Typ 4.5 15.0 45.0 Units pF pF pF VCC = OPEN VCC = 5.0V VCC = 5.0V Conditions
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