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Part: IN74ALS245AN
Category:
Logic
Description: Octal Bus Transceiver, Ninv (3-State) 20
Company: IK Semiconductor
Datasheet: Download IN74ALS245AN datasheet File size : 288 kB
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TECHNICAL DATA
IN74ALS245
Octal 3-State Noninverting Bus Transceiver
This device contains eight pairs of 3-state logic elements designed for asynchronous two-way communication between data buses. These circuits are suited for use in memory, microprocessor systems and asynchronous bi-directional data buses. The Enable input (E) can be used to isolate the buses. · Non-inverting logic output · Switching response specified into 500/50 pF · Switching specifications guaranteed over full temperature and VCC range · Low level drive current: 54ALS = 12 mA, 74ALS = 24 mA
ORDERING INFORMATION IN74ALS245N Plastic IN74ALS245DW SOIC TA = -10° to 70° C for all packages
LOGIC DIAGRAM
PIN ASSIGNMENT
FUNCTION TABLE
Control Inputs PIN 20=VCC PIN 10 = GND Output Enable L Directio n L Op e ratio n Data Transmitted from Bus B to Bus A Data Transmitted from Bus A to Bus B Buses Isolated (High Impedance State)
L
H
H
X
X = don't care
1
IN74ALS245
MAXIMUM RATINGS*
Symbol VCC VIN V OUT Tstg
*
Parameter Supply Voltage Input Voltage Output Voltage Storage Temperature Range
Value 7.0 7 .0 5 .5 -65 to +150
Unit V V V °C
Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VIH VIL I OH I OL TA Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Ambient Temperature Range -10 Parameter Min 4.5 2 .0 0 .8 -15 24 +70 M ax 5.5 Unit V V V mA mA °C
DC ELECTRICAL CHARACTERISTICS over full operating conditions
Guaranteed Limit Symbol VIK V OH Parameter Input Clamp Voltage High Level Output Voltage Test Conditions VCC = min, IIN = -18 mA VCC = min, IOH = -0.4 mA VCC = min, IOH = -3.0 mA VCC = min, IOH = -15 mA V OL I OZH I OZL IIH Low Level Output Voltage Output Off Current HIGH Output Off Current LOW High Level Input Current VCC = min, IOL = 12 mA VCC = min, IOL = 24 mA VCC = max, VOUT = 2.7 V VCC = max, VOUT = 0.4 V VCC = max, VIN = 2.7 V VCC = max, VIN = 5.5 V VCC = max, VIN = 7.0 V for Pin1, Pin 19 IIL IO ICC Low Level Input Current Output Short Circuit Current Supply Current VCC = max, VIN = 0.4 V VCC = max, VO = 2.25 V VCC = max Outputs High Outputs Low 3-State (High Z) -30 2.5 2.4 2.0 0.4 0.5 20 -20 20 0 .1 0.1 -0.1 -112 45 55 58 mA mA mA µA µA µA mA V Min M ax -1.5 Unit V V
2
IN74ALS245
AC ELECTRICAL CHARACTERISTICS over full operating conditions (VCC = 5.0 V±10%,
CL = 50 pF, RL1: = RL2 = 500, Input tr = tf = 2.0 ns) Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time, Low-to-High Level Output (from A or B to Output) Propagation Delay Time, High-to-Low Level Output (from A or B to Output) Output Enable Time to High Level (from OE to Output) Output Enable Time to Low Level (from OE to Output) Output Disable Time from High Level (from OE to Output) Output Disable Time from Low Level (from OE to Output) Min M ax 10 10 20 20 40 35 Unit ns ns ns ns ns ns
tPZL, tPLZ - S1 closed tPZH, tPHZ - S1 opened Figure 1. Switching Waveforms Figure 2. Switching Waveforms
* Includes all probe and jig capacitance. Figure 3. Test Circuit
* Includes all probe and jig capacitance. Figure 4. Test Circuit
3
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