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DM74AS245 Octal Bus Transceiver with 3-STATE Outputs
October 1986 Revised February 2000
DM74AS245 Octal Bus Transceiver with 3-STATE Outputs
General Description
This advanced Schottky device contains 8 pairs of 3-STATE logic elements configured as octal bus transceivers. These circuits are designed for use in memory, microprocessor systems and in asynchronous bidirectional data buses. Two way communication between buses is controlled by the (DIR) input. Data transmits either from the A bus to the B bus or from the B bus to the A bus. Both the driver and receiver outputs can be disabled via the (G) enable input which causes outputs to enter the high impedance mode so that the buses are effectively isolated.
Features
s Advanced oxide-isolated, ion-implanted Schottky TTL process s Non-inverting logic output s 3-STATE outputs independently controlled on A and B buses s Low output impedance to drive terminated transmission lines to 133 s Switching response specified into 500/50 pF s Specified to interface with CMOS at VOH = VCC - 2V s PNP inputs reduce input loading s Switching specifications guaranteed over full temperature and VCC range
Ordering Code:
Order Number DM74AS245WM DM74AS245SJ DM74AS245N Package Number M20B M20D N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagram
Function Table
Control Inputs G L L H DIR L H X B Data to A Bus A Data to B Bus Hi-Z Operation
(c) 2000 Fairchild Semiconductor Corporation
DS006299
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DM74AS245
Absolute Maximum Ratings(Note 1)
Supply Voltage, VCC Input Voltage Control Inputs I/O Ports Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 51.5C/W 76.0C/W 7V 5.5V 0C to 70C -65C to +150C
Note 1: The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation.
7V
Recommended Operating Conditions
Symbol VCC VIH VIL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4.5 2 0.8 -15 48 70 Typ 5 Max 5.5 Units V V V mA mA C
Electrical Characteristics
over recommended operating free air temperature range Symbol VIK VOH Parameter Input Clamp Voltage HIGH Level Output Voltage VOL II IIH IIL IO ICC LOW Level Output Voltage Input Current at Max Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current Conditions VCC = 4.5V, IIN = -18 mA VCC = 4.5V, IOH = -3 mA VCC = 4.5V, IOH = -15 mA IOH = -2 mA, VCC = 4.5V to 5.5V VCC = 4.5V, IOL = Max VCC = 5.5V, VIN = 7V, (VIN = 5.5V for A or B Ports) VCC = 5.5V, VIN = 2.7V VCC = 5.5V, VIN = 0.4V VCC = 5.5V, VOUT = 2.25V VCC = 5.5V Output HIGH Output LOW 3-STATE Control Inputs A or B Ports Control Inputs A or B Ports -50 62 95 79 2.4 2 VCC - 2 0.35 0.55 0.1 20 70 -0.5 -0.75 -150 97 149 123 mA V mA A mA mA 3.2 2.3 V Min Typ Max -1.2 Units V
Switching Characteristics
over recommended operating free air temperature range Symbol tPLH tPHL Parameter Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time HIGH-to-LOW Level Output tPZL tPZH tPLZ tPHZ Output Enable Time to LOW Level Output Enable Time to HIGH Level Output Disable Time from LOW Level Output Disable Time from HIGH Level Conditions VCC = 4.5V to 5.5V, R1 = R2 = 500, CL = 50 pF From A or B A or B G G G G To B or A B or A A or B A or B A or B A or B Min 2 2 2 2 2 2 Max 7.5 7 8.5 9 9.5 5.5 Units ns ns ns ns ns ns
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DM74AS245
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B
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DM74AS245
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D
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DM74AS245 Octal Bus Transceiver with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 5 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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