STMICROELECTRONICS 74LCX240TTR

74LCX240
LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE INV.)
WITH 5V TOLERANT INPUTS AND OUTPUTS
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5V TOLERANT INPUTS AND OUTPUTS
HIGH SPEED :
tPD = 6.5 ns (MAX.) at VCC = 3V
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24mA (MIN) at VCC = 3V
PCI BUS LEVELS GUARANTEED AT 24 mA
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
OPERATING VOLTAGE RANGE:
VCC(OPR) = 2.0V to 3.6V (1.5V Data
Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 240
LATCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
DESCRIPTION
The 74LCX240 is a low voltage CMOS OCTAL
BUS BUFFER fabricated with sub-micron silicon
gate and double-layer metal wiring C2MOS
technology. It is ideal for low power and high
SOP
TSSOP
ORDER CODES
PACKAGE
TUBE
T&R
SOP
TSSOP
74LCX240M
74LCX240MTR
74LCX240TTR
speed 3.3V applications; it can be interfaced to 5V
signal environment for both inputs and outputs.
It has same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
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
September 2001
1/9
74LCX240
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
PIN No
SYMBOL
1
2, 4, 6, 8
9, 7, 5, 3
11, 13, 15,
17
18, 16, 14,
12
19
10
20
1G
1A1 to 1A4
2Y1 to 2Y4
2A1 to 2A4
Output Enable Input
Data Inputs
Data Outputs
Data Inputs
1Y1 to 1Y4
Data Outputs
2G
GND
VCC
NAME AND FUNCTION
INPUT
OUTPUT
G
An
Yn
L
L
H
L
H
X
H
L
Z
X : Don’t Care
Z : High Impedance
Output Enable Input
Ground (0V)
Positive Supply Voltage
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Parameter
Value
Unit
Supply Voltage
-0.5 to +7.0
V
VI
DC Input Voltage
-0.5 to +7.0
V
VO
DC Output Voltage (OFF State)
-0.5 to +7.0
V
VO
DC Output Voltage (High or Low State) (note 1)
IIK
DC Input Diode Current
-0.5 to VCC + 0.5
- 50
mA
IOK
DC Output Diode Current (note 2)
- 50
mA
IO
DC Output Current
± 50
mA
V
ICC
DC Supply Current per Supply Pin
± 100
mA
IGND
DC Ground Current per Supply Pin
± 100
mA
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
-65 to +150
°C
300
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
1) IO absolute maximum rating must be observed
2) VO < GND
2/9
74LCX240
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Supply Voltage (note 1)
Value
Unit
2.0 to 3.6
V
0 to 5.5
V
VI
Input Voltage
VO
Output Voltage (OFF State)
0 to 5.5
V
VO
Output Voltage (High or Low State)
0 to VCC
V
± 24
mA
± 12
mA
IOH, IOL
High or Low Level Output Current (VCC = 3.0 to 3.6V)
IOH, IOL
High or Low Level Output Current (VCC = 2.7V)
Top
dt/dv
Operating Temperature
Input Rise and Fall Time (note 2)
-55 to 125
°C
0 to 10
ns/V
1) Truth Table guaranteed: 1.5V to 3.6V
2) VIN from 0.8V to 2V at VCC = 3.0V
DC SPECIFICATIONS
Test Condition
Symbol
VIH
VIL
VOH
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Ioff
IOZ
ICC
∆ICC
Input Leakage
Current
Power Off Leakage
Current
High Impedance
Output Leakage
Current
Quiescent Supply
Current
ICC incr. per Input
Min.
Max.
2.0
-55 to 125 °C
Min.
Unit
Max.
2.0
V
2.7 to 3.6
0.8
0.8
2.7 to 3.6
IO=-100 µA
VCC-0.2
VCC-0.2
2.7
IO=-12 mA
2.2
2.2
IO=-18 mA
2.4
2.4
IO=-24 mA
2.2
V
V
2.2
2.7 to 3.6
IO=100 µA
0.2
0.2
2.7
IO=12 mA
0.4
0.4
IO=16 mA
0.4
0.4
IO=24 mA
0.55
0.55
2.7 to 3.6
VI = 0 to 5.5V
±5
±5
µA
0
VI or VO = 5.5V
10
10
µA
2.7 to 3.6
VI = VIH or VIL
VO = 0 to VCC
±5
±5
µA
3.0
II
-40 to 85 °C
VCC
(V)
3.0
VOL
Value
2.7 to 3.6
2.7 to 3.6
VI = VCC or GND
10
10
VI or VO= 3.6 to 5.5V
± 10
± 10
VIH = VCC - 0.6V
500
500
V
µA
µA
3/9
74LCX240
DYNAMIC SWITCHING CHARACTERISTICS
Test Condition
Symbol
VOLP
VOLV
Parameter
Value
TA = 25 °C
VCC
(V)
Dynamic Low Level Quiet
Output (note 1)
Min.
Typ.
Max.
0.8
CL = 50pF
VIL = 0V, VIH = 3.3V
3.3
Unit
V
-0.8
1) Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is
measured in the LOW state.
AC ELECTRICAL CHARACTERISTICS
Test Condition
Symbol
Parameter
tPLH tPHL
Propagation Delay
Time
tPZL tPZH
Output Enable Time
tPLZ tPHZ
Output Disable Time
tOSLH
tOSHL
Output To Output
Skew Time (note1,
2)
VCC
(V)
2.7
3.0 to 3.6
2.7
3.0 to 3.6
2.7
3.0 to 3.6
3.0 to 3.6
Value
CL
(pF)
RL
(Ω)
ts = t r
(ns)
50
500
2.5
50
500
2.5
50
500
2.5
50
500
2.5
-40 to 85 °C
-55 to 125 °C
Min.
Max.
Min.
Max.
1.5
1.5
1.5
1.5
1.5
1.5
7.5
6.5
9.0
8.0
8.0
7.0
1.0
1.5
1.5
1.5
1.5
1.5
1.5
8.5
7.5
10.5
9.2
9.2
8.3
1.0
Unit
ns
ns
ns
ns
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the same direction, either HIGH or LOW (tOSLH = | tPLHm - t PLHn|, tOSHL = | tPHLm - tPHLn|)
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
CIN
Parameter
Value
TA = 25 °C
VCC
(V)
Min.
Typ.
Unit
Max.
Input Capacitance
3.3
VIN = 0 to VCC
6
pF
COUT
Output Capacitance
3.3
VIN = 0 to VCC
10
pF
CPD
Power Dissipation Capacitance
(note 1)
3.3
fIN = 10MHz
VIN = 0 or VCC
40
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)
4/9
74LCX240
TEST CIRCUIT
TEST
tPLH, tPHL
SWITCH
Open
tPZL, tPLZ
6V
tPZH, tPHZ
GND
CL = 50 pF or equivalent (includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1 : PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
5/9
74LCX240
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
6/9
74LCX240
SO-20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
a1
MAX.
MIN.
TYP.
2.65
0.1
0.104
0.2
a2
MAX.
0.004
0.008
2.45
0.096
b
0.35
0.49
0.014
0.019
b1
0.23
0.32
0.009
0.012
C
0.5
0.020
c1
45° (typ.)
D
12.60
13.00
0.496
0.512
E
10.00
10.65
0.393
0.419
e
1.27
0.050
e3
11.43
0.450
F
7.40
7.60
0.291
0.300
L
0.50
1.27
0.020
0.050
M
S
0.75
0.029
8° (max.)
PO13L
7/9
74LCX240
TSSOP20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
A
MIN.
TYP.
MAX.
1.2
A1
0.05
A2
0.8
b
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0089
D
6.4
6.5
6.6
0.252
0.256
0.260
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
1
e
0.65 BSC
K
0°
L
0.45
A
0.0256 BSC
0.60
8°
0°
0.75
0.018
8°
0.024
0.030
A2
A1
b
K
e
L
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
8/9
74LCX240
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mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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