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| 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 FASTTM SCHOTTKY TTL * High-Impedance NPN Base Inputs for Reduced Loading * 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 1 (70 A in High and Low States) 20 PIN ASSIGNMENT VCC OE 20 19 B0 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 20 1 N SUFFIX PLASTIC CASE 738-03 20 1 DW SUFFIX SOIC CASE 751D-03 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 L L H T/R 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 3 4 5 6 7 A5 8 9 A0 A1 1 19 T/R OE B0 B1 18 17 A2 A3 A4 A6 A7 B2 B3 B4 16 15 14 B5 13 B6 B7 12 11 FAST AND LS TTL DATA 4-238 MC74F640 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOH IOL IOL DC Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- High Output Current -- Low Output Current -- Low An Outputs Bn Outputs An Outputs Bn Outputs Parameter 74 74 74 74 74 74 Min 4.5 0 Typ 5.0 25 Max 5.5 70 -3.0 -15 24 64 Unit V C mA mA mA mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage 74 An VOH Output HIGH Voltage Bn 74 74 74 74 VOL VOL IOZH + IIH IOZL + IIL Output LOW Voltage Output LOW Voltage Output Off Current HIGH Output Off Current LOW OE, T/R IIH Input HIGH Current OE, T/R Others IIL IOS Input LOW Current Output Short Circuit Current2 OE, T/R A0 - A7 B0 - B7 ICCH ICC Power Supply Current ICCL ICCZ - 60 -100 An Bn 74 74 2.4 2.7 2.4 2.7 2.0 0.35 0.5 0.55 70 - 70 40 100 1.0 - 40 -150 mA - 225 85 120 100 mA VCC = MAX, VOUT = GND Vout = HIGH T/R = 4.5 V Vout = LOW T/R = 0 V OE = 4.5 V Vout = HIGH Z VCC = MAX 3.3 3.3 3.4 3.4 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V V V V V A A A A mA A Test Conditions1 Guaranteed as a HIGH Signal Guaranteed as a LOW Signal VCC = MIN, IIN = -18 mA IOH = -3.0 mA IOH = -3.0 mA IOH = -3.0 mA IOH = -3.0 mA IOH = -15 mA IOL = 24 mA IOL = 64 mA VCC = MAX VCC = MAX VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VCC = MIN VCC = MIN VOUT = 2.7 V VOUT = 0.5 V VCC = MAX, VIN = 2.7 V VCC = 0 V, VIN = 7.0 V VCC = MAX, VIN = 5.5 V VCC = MAX, VIN = 0.5 V 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 A0 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 OE 19 T/R 1 18 B0 17 B1 16 B2 15 B3 14 B4 13 B5 12 B6 11 B7 VCC = PIN 20 GND = PIN 10 AC ELECTRICAL CHARACTERISTICS 74F TA = +25C VCC = +5.0 V CL = 50 pF RL = 500 Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay An to Bn, Bn to An Output Enable Time to High or Low Level Output Disable Time to High or Low Level Min 2.0 1.0 3.5 6.0 1.5 1.0 Typ Max 7.0 5.0 11 11 8.0 7.0 Min 2.0 1.0 3.5 6.0 1.5 1.0 74F TA = 0C to +70C VCC = +5.0 V 10% CL = 50 pF RL = 500 Typ Max 8.0 5.5 13 12 9.0 7.5 Unit ns ns ns FAST AND LS TTL DATA 4-240 |
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