For:char Printed on:Mon, Feb 6, 1995 09:51:45 From book:DL121CH4 (5) VIEW Document:MC74F640 (5) VIEW Last saved on:Fri, Feb 3, 1995 16:10:59 MC74F640 OCTAL BUS TRANSCEIVER, INVERTING WITH 3-STATE OUTPUTS The MC74F640 is an octal transceiver featuring inverting 3-state bus compatible outputs in both transmit and receive directions. The B port outputs are capable of sinking 64 mA and sourcing 15 mA, providing very good capacitive drive characteristics. The device features an Output Enable (OE) input for easy cascading and Transmit/Receive (T/R) input for direction control. The 3-state outputs, B0–B7, have been designed to prevent output bus loading if the power is removed from the device. OCTAL BUS TRANSCEIVER, INVERTING WITH 3-STATE OUTPUTS FAST SCHOTTKY TTL • High-Impedance NPN Base Inputs for Reduced Loading (70 µA in High and Low States) • Ideal for Applications which Require High-Output Drive and Minimal • • • • Bus Loading Inverting Version of F245 Octal Bidirectional Bus Interface 3-State Buffer Outputs Sink 64 mA and Source 15 mA ESD Sensitive — 4000 V HBM J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 PIN ASSIGNMENT VCC OE 20 19 B0 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 20 1 DW SUFFIX SOIC CASE 751D-03 20 1 1 T/R 2 A0 3 A1 4 A2 5 A3 6 A4 7 A5 8 A6 9 A7 10 GND ORDERING INFORMATION MC74FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXDW SOIC FUNCTION TABLE Inputs OE T/R L L H L H X Outputs Bus B data to Bus A Bus A data to Bus B Z H = High Voltage Level L = Low Voltage Level X = Don’t Care Z = High Impedance “Off” State LOGIC SYMBOL 2 1 T/R 19 OE 4-238 4 5 6 7 8 9 A0 A1 A2 A3 A4 A5 A6 A7 B0 B1 B2 B3 B4 B5 B6 B7 13 12 18 FAST AND LS TTL DATA 3 17 16 15 14 11 MC74F640 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC DC Supply Voltage 74 4.5 5.0 5.5 V TA Operating Ambient Temperature Range 74 0 25 70 °C IOH Output Current — High An Outputs 74 –3.0 mA IOH Output Current — High Bn Outputs 74 –15 mA IOL Output Current — Low An Outputs 74 24 mA IOL Output Current — Low Bn Outputs 74 64 mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage Max 2.0 An VOH Typ Output HIGH Voltage Bn Unit Test Conditions1 V Guaranteed as a HIGH Signal 0.8 V Guaranteed as a LOW Signal –1.2 V VCC = MIN, IIN = –18 mA 74 2.4 3.3 V IOH = –3.0 mA VCC = 4.5 V 74 2.7 3.3 V IOH = –3.0 mA VCC = 4.75 V 74 2.4 3.4 V IOH = –3.0 mA VCC = 4.5 V 74 2.7 3.4 V IOH = –3.0 mA VCC = 4.75 V 74 2.0 V IOH = –15 mA VCC = 4.5 V V IOL = 24 mA VCC = MIN VOL Output LOW Voltage An 74 VOL Output LOW Voltage Bn 74 0.55 V IOL = 64 mA VCC = MIN IOZH + IIH Output Off Current HIGH 70 µA VCC = MAX VOUT = 2.7 V IOZL + IIL Output Off Current LOW – 70 µA VCC = MAX VOUT = 0.5 V OE, T/R 40 µA VCC = MAX, VIN = 2.7 V OE, T/R 100 µA VCC = 0 V, VIN = 7.0 V Others 1.0 mA VCC = MAX, VIN = 5.5 V – 40 µA VCC = MAX, VIN = 0.5 V mA VCC = MAX, VOUT = GND IIH IIL IOS ICC Input HIGH Current Input LOW Current Output Short Circuit Current2 Power Supply Current 0.35 OE, T/R 0.5 A0 – A7 – 60 –150 B0 – B7 –100 – 225 ICCH 85 ICCL 120 ICCZ 100 Vout = HIGH T/R = 4.5 V mA Vout = LOW T/R = 0 V VCC = MAX OE = 4.5 V Vout = HIGH Z NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type. 2. Not more than one output should be shorted at a time, nor for more than 1 second. FAST AND LS TTL DATA 4-239 MC74F640 LOGIC DIAGRAM OE T/R A0 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 18 B0 17 B1 16 B2 15 B3 14 B4 13 B5 12 B6 11 B7 19 1 VCC = PIN 20 GND = PIN 10 AC ELECTRICAL CHARACTERISTICS Symbol Parameter Min 74F 74F TA = +25°C VCC = +5.0 V CL = 50 pF RL = 500 Ω TA = 0°C to +70°C VCC = +5.0 V ±10% CL = 50 pF RL = 500 Ω Typ Max Min Typ Max Unit tPLH tPHL Propagation Delay An to Bn, Bn to An 2.0 1.0 7.0 5.0 2.0 1.0 8.0 5.5 ns tPZH tPZL Output Enable Time to High or Low Level 3.5 6.0 11 11 3.5 6.0 13 12 ns tPHZ tPLZ Output Disable Time to High or Low Level 1.5 1.0 8.0 7.0 1.5 1.0 9.0 7.5 ns FAST AND LS TTL DATA 4-240