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| MM74HCT245 Octal 3-STATE Transceiver February 1984 Revised May 2005 MM74HCT245 Octal 3-STATE Transceiver General Description The MM74HCT245 3-STATE bi-directional buffer utilizes advanced silicon-gate CMOS technology and is intended for two-way asynchronous communication between data buses. It has high drive current outputs which enable high speed operation even when driving large bus capacitances. This circuit possesses the low power consumption of CMOS circuitry, yet has speeds comparable to low power Schottky TTL circuits. This device is TTL input compatible and can drive up to 15 LS-TTL loads, and all inputs are protected from damage due to static discharge by diodes to VCC and ground. The MM74HCT245 has one active low enable input (G), and a direction control (DIR). When the DIR input is HIGH, data flows from the A inputs to the B outputs. When DIR is LOW, data flows from B to A. MM74HCT devices are intended to interface between TTL and NMOS components and standard CMOS devices. These parts are also plug-in replacements for LS-TTL devices and can be used to reduce power consumption in existing designs. Features s TTL input compatible s 3-STATE outputs for connection to system busses s High output drive current: 6 mA (min) s High speed: 16 ns typical propagation delay s Low power: 80 PA (74HCT Series) Ordering Code: Order Number MM74HCT245WM MM74HCT245SJ MM74HCT245MTC MM74HCT245N Package Number M20B M20D MTC20 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 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 Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Connection Diagram Pin Assignments for DIP, SOIC, SOP and TSSOP Truth Table Control Inputs G L L H H HIGH Level L LOW Level X Irrelevant Operation DIR L H X 245 B data to A bus A data to B bus isolation Top View (c) 2005 Fairchild Semiconductor Corporation DS005366 www.fairchildsemi.com MM74HCT245 Logic Diagram www.fairchildsemi.com 2 MM74HCT245 Absolute Maximum Ratings(Note 1) (Note 2) Supply Voltage (VCC ) DC Input Voltage (VIN) DC Output Voltage (VOUT) Clamp Diode Current (IIK, IOK) DC Output Current, DC VCC or GND Current, per pin (ICC) Storage Temperature Range (TSTG) Power Dissipation (PD) (Note 3) S.O. Package only Lead Temperature (TL) (Soldering 10 seconds) 260qC 600 mW 500 mW Recommended Operating Conditions Min Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) Input Rise or Fall Times (tr, tf) 500 ns Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Note 2: Unless otherwise specified all voltages are referenced to ground. Note 3: Power Dissipation temperature derating -- plastic "N" package: 12 mW/qC from 65qC to 85qC. 0.5 to 7.0V 1.5 to VCC 1.5V 0.5 to VCC 0.5V r20 mA r35 mA r70 mA 65qC to 150qC Max 5.5 VCC Units V V 4.5 0 40 85 qC DC Electrical Characteristics (VCC Symbol VIH VIL VOH 5V r 10%, unless otherwise specified.) Parameter Minimum HIGH Level Input Voltage Maximum LOW Level Input Voltage Minimum HIGH Level Output Voltage VIN |IOUT | |IOUT | |IOUT | VOL Maximum LOW Level Voltage VIN |IOUT | |IOUT | |IOUT | IIN IOZ Maximum Input Current Maximum 3-STATE Output Leakage Current ICC Maximum Quiescent Supply Current VIN IOUT VIN VCC or GND 0 PA 2.4V or 0.5V (Note 4) 0.6 1.0 1.3 1.5 mA 8 80 160 VIN VOUT G VIH VIH or VIL 20 PA 6.0 mA, VCC 7.2 mA, VCC VIH or VIL 20 PA 6.0 mA, VCC 7.2 mA, VCC VCC or GND, VCC or GND 4.5V 5.5V 0 0.2 0.2 0.1 0.26 0.26 0.1 0.33 0.33 0.1 0.4 0.4 V V V 4.5V 5.5V VCC 4.2 5.2 VCC 0.1 3.98 4.98 VCC 0.1 3.84 4.84 VCC 0.1 3.7 4.7 V V V 0.8 0.8 0.8 V Conditions TA Typ 2.0 25qC TA 40 to 85qC TA 55 to 125qC Guaranteed Limits 2.0 2.0 Units V r0.1 r0.5 r1.0 r5.0 r1.0 r10 PA PA VIH or VIL, Pin 1 or 19 PA Note 4: Measured per input. All other inputs at VCC or ground. 3 www.fairchildsemi.com MM74HCT245 AC Electrical Characteristics VCC 5.0V, tr tf 6 ns, TA 25qC (unless otherwise specified) Parameter Maximum Output Propagation Delay tPZL, tPZH tPLZ, tPHZ Maximum Output Enable Time Maximum Output Disable Time CL RL CL RL 45 pF 1 k: 5 pF 1 k: 20 25 ns 29 40 ns CL 45 pF Conditions Typ 16 Guaranteed Limit 20 Units ns Symbol tPHL, tPLH AC Electrical Characteristics VCC 5.0V r 10%, tr tf 6 ns (unless otherwise specified) Conditions CL CL RL CL RL CL RL CL CL 50 pF 150 pF 1 k: 50 pF 1 k: 50 pF 1 k: 50 pF 50 pF 8 10 20 12 15 25 15 15 25 18 15 25 ns pF pF 21 30 38 45 ns 23 33 41 49 ns TA Typ tPHL, tPLH tPZL tPZH tPHZ, tPLZ tTHL, tTLH CIN COUT Maximum Output Propagation Delay Maximum Output Enable Time Maximum Output Enable Time Maximum Output Disable Time Maximum Output Rise and Fall Time Maximum Input Capacitance Maximum Output/Input Capacitance CPD Power Dissipation Capacitance G G VCC (Note 5) GND 7 100 CPD VCC2 f I CCVCC, and the no load dynamic current consumption, Symbol Parameter 25qC TA 40 to 85qC TA 55 to 125qC Guaranteed Limits 29 38 53 34 45 63 Units ns ns ns 17 24 31 23 30 42 pF pF Note 5: CPD determines the no load power consumption, PD IS CPD V CC f ICC. www.fairchildsemi.com 4 MM74HCT245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B 5 www.fairchildsemi.com MM74HCT245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D www.fairchildsemi.com 6 MM74HCT245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC20 7 www.fairchildsemi.com MM74HCT245 Octal 3-STATE Transceiver 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. www.fairchildsemi.com 8 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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