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Part: 74AC240MTR
Category:
Logic
-> CMOS/BiCMOS->AC/ACT Family->Advanced High Speed CM
Description: Octal Bus Buffer With 3 State Outputs (INVERTED)
Company: ST Microelectronics, Inc.
Datasheet: Download 74AC240MTR datasheet File size : 232 kB
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Datasheet text preview:
74AC240
OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED)
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H IGH SPEED: tPD = 4.2ns (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 240 IMPROVED LATCH-UP IMMUNITY
DIP
SOP
TSSOP
ORDER CODES
PACKAGE DIP SOP TSSOP TUBE 74AC240B 74AC240M T&R 74AC240MTR 74AC240TTR
DESCRIPTION The 74AC240 is an advanced high-speed CMOS OCTAL BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology. G control input governs four BUS BUFFERs.
This device is designed to be used with 3 state memory address drivers, etc. 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
74AC240
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1 2, 4, 6, 8 9, 7, 5, 3 11, 13, 15, 17 18, 16, 14, 12 19 10 20 SYMBOL 1G 1A1 to 1A4 2Y1 to 2Y4 2A1 to 2A4 1Y1 to 1Y4 2G GND V CC NAME AND FUNCTION Output Enable Input Data Inputs Data Outputs Data Inputs Data Outputs Output Enable Input Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS G L L H
X : Don't Care Z : High Impedance
OUTPUT An L H X Yn H L Z
ABSOLUTE MAXIMUM RATINGS
Symbol V CC VI VO IIK IOK IO Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Storage Temperature Lead Temperature (10 sec) 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
Absolute Maximum Ratings are those values beyond which damage to the device may occour. 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
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74AC240
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 ± 2.5 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 ±5 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
74AC240
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. 5.7 4.2 7.0 5.0 7.0 6.5 Max. 8.0 6.5 10.5 8.0 10.5 9.0 -40 to 85°C Min. 1.5 1.5 1.5 1.5 1.5 1.5 Max. 9.0 7.0 11.0 8.5 11.5 9.5 -55 to 125°C Min. 1.5 1.5 1.5 1.5 1.5 1.5 Max. 11.0 8.5 13.0 10.5 13.5 11.0 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 9 21 Max. Value -40 to 85°C Min. Max. -55 to 125°C Min. Max. pF pF Unit
CIN CO U T CPD
Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1)
pF
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 f IN + ICC/8 (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
74AC240
W AVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
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