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Part: 74AC245MTR
Category:
Logic
-> CMOS/BiCMOS->AC/ACT Family->Advanced High Speed CM
Description: Octal Bus Transceiver With 3-STATE Outputs (NON INVERTED)
Company: ST Microelectronics, Inc.
Datasheet: Download 74AC245MTR datasheet File size : 232 kB
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Datasheet text preview:
74AC245
OCTAL BUS TRANSCEIVER WITH 3 STATE OUTPUTS (NON INVERTED)
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H IGH SPEED: tPD = 4.5ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4µA(MAX.) at TA=25°C H IGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) 50 TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 244 IMPROVED LATCH-UP IMMUNITY
DIP
SOP
TSSOP
ORDER CODES
PACKAGE DIP SOP TSSOP TUBE 74AC245B 74AC245M T&R 74AC245MTR 74AC245TTR
DESCRIPTION The 74AC245 is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology. This IC is intended for two-way asynchronous communication between data buses and the direction of data transmission is determined by
DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated.. All floating bus terminals during HIGH-Z state must be held HIGH or LOW All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 2001
1/9
74AC245
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 19 10 20 SYMBOL DIR A1 to A8 B1 to B8 NAME AND FUNCTION Directional Control Data Inputs/Outputs Data Inputs/Outputs
G GND V CC
Output Enable Input Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS G L L H
X : Don't Care Z : High Impedance
FUNCTION DIR L H X A BUS OUTPUT INPUT Z B BUS INPUT OUTPUT Z
OUTPUT Yn A=B B=A Z
ABSOLUTE MAXIMUM RATINGS
Symbol V CC VI VO IIK IOK IO Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 ± 20 ± 20 ± 50 ± 400 -65 to +150 300 Unit V V V mA mA mA mA °C °C
ICC or IGND DC VCC or Ground Current Tstg Storage Temperature TL Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol V CC VI VO Top dt/dv Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5V (note 1) Parameter Value 2 to 6 0 to VCC 0 to VCC -55 to 125 8 Unit V V V °C ns/V
1) VIN from 30% to 70% of V CC
2/9
74AC245
DC SPECIFICATIONS
Test Condition Symbol Parameter VCC (V) 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 VOL Low Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 II Ioz Input Leakage Current High Impedance Output Leakage Current Quiescent Supply Current Dynamic Output Current (note 1, 2) 5.5 5.5 5.5 5.5 VO = 0.1 V or VCC-0.1V VO = 0.1 V or VCC-0.1V IO=-50 µA IO=-50 µA IO=-50 µA IO=-12 mA IO=-24 mA IO=-24 mA IO=50 µA IO=50 µA IO=50 µA IO=12 mA IO=24 mA IO=24 mA VI = VCC or GND VI = VIH or VIL VO = VCC or GND VI = VCC or GND VOLD = 1.65 V max VOHD = 3.85 V min 2.9 4.4 5.4 2.56 3.86 4.86 0.002 0.001 0.001 0.1 0.1 0.1 0.36 0.36 0.36 ± 0.1 ± 0.5 4 TA = 25°C Min. 2.1 3.15 3.85 Typ. 1.5 2.25 2.75 1.5 2.25 2.75 2.99 4.49 5.49 Max. Value -40 to 85°C Min. 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.46 3.76 4.76 0.1 0.1 0.1 0.44 0.44 0.44 ±1 ±5 40 75 -75 0.9 1.35 1.65 2.9 4.4 5.4 2.4 3.7 4.7 0.1 0.1 0.1 0.5 0.5 0.5 ±1 ± 10 80 50 -50 µA µA µA mA mA V V Max. -55 to 125°C Min. 2.1 3.15 3.85 0.9 1.35 1.65 Max. V Unit
VIH
High Level Input Voltage Low Level Input Voltage High Level Output Voltage
VIL
V
VOH
ICC IOLD IOHD
1) Maximum test duration 2ms, one output loaded at time 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50
3/9
74AC245
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = tf = 3ns)
Test Condition Symbol Parameter VCC (V) 3.3 5.0
(*)
Value TA = 25°C Min. 1.5 1.5 1.5 1.5 1.5 1.5 Typ. 5.5 4.5 7.5 5.5 6.2 5.2 Max. 8.5 6.5 12.0 9.0 12.0 9.0 -40 to 85°C Min. 1.5 1.5 1.5 1.5 1.5 1.5 Max. 9.0 7.0 13.5 9.5 13.0 10.0 -55 to 125°C Min. 1.5 1.5 1.5 1.5 1.5 1.5 Max. 11.5 8.5 14.0 10.5 14.0 10.5 ns ns Unit
tPLH tPHL Propagation Delay Time tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time
(*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5V
(**)
3.3(*) 5.0(**) 3.3(*) 5.0
(**)
ns
CA PACITIVE CHARACTERISTICS
Test Condition Symbol Parameter VCC (V) 5.0 5.0 5.0 fIN = 10MHz TA = 25°C Min. Typ. 5 10 21 Max. Value -40 to 85°C Min. Max. -55 to 125°C Min. Max. pF pF pF Unit
CIN CI/O CPD
Input Capacitance I/O Capacitance Power Dissipation Capacitance (note 1)
1) CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/16 (per circuit)
TEST CIRCUIT
TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ
CL = 50pF or equivalent (includes jig and probe capacitance) RL = R1 = 500 or equivalent RT = ZOUT of pulse generator (typically 50)
SWITCH Open 2VCC Open
4/9
74AC245
W AVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
5/9
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