Page 1
74LCX240
LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE INV.)
WITH 5V TOLERANT INPUTS AND OUTPUTS
■ 5V TOLERANT INPUTS AND OUTPUTS
■ HIGH SPEED :
t
= 6.5 ns (MAX.) at VCC = 3V
PD
■ POWER DOWN PROTECTION ON INPUT S
AND OUTPUTS
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
| = IOL = 24mA (MIN) at VCC = 3V
OH
■ PCI BUS LEVELS GUARANT EED AT 2 4 mA
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PLH
■ OPERATING VOLTAGE RANGE:
V
CC
PHL
(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 C
2
MOS
technology. It is ideal for low power and high
TSSOPSOP
ORDER CODES
PACKAGE TUBE T & R
SOP 74LCX240M 74LCX240MTR
TSSOP 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 stat ic discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/9September 2001
Page 2
74LCX240
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION TRUTH TABLE
PIN No SYMBOL NAME AND FUNCTION
11G
Output Enable Input
2, 4, 6, 8 1A1 to 1A4 Data Inputs
9, 7, 5, 3 2Y1
to 2Y4 Data Outputs
11, 13, 15, 172A1 to 2A4 Data Inputs
18, 16, 14, 121Y1
19 2G
to 1Y4 Data Outputs
Output Enable Input
X : Don’t Care
Z : High Impedance
INPUT OUTPUT
G
An Yn
LLH
LHL
HXZ
10 GND Ground (0V)
20 V
CC
Positive Supply Voltage
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
V
I
I
OK
I
I
CC
I
GND
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
1) I
absolute ma xim um rating mu st be observed
O
2) V
< GND
O
Supply Voltage
CC
DC Input Voltage
I
DC Output Voltage (OFF State)
O
DC Output Voltage (High or Low State) (note 1) -0.5 to VCC + 0.5
O
DC Input Diode Current
IK
DC Output Diode Current (note 2)
DC Output Current
O
DC Supply Current per Supply Pin
DC Ground Current per Supply Pin
Storage Temperature
stg
Lead Temperature (10 sec)
L
-0.5 to +7.0 V
-0.5 to +7.0 V
-0.5 to +7.0 V
V
- 50 mA
- 50 mA
± 50 mA
± 100 mA
± 100 mA
-65 to +150 °C
300 °C
2/9
Page 3
74LCX240
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
V
V
V
I
OH
I
OH
T
dt/dv Input Rise and Fall Time (note 2) 0 to 10 ns/V
1) Truth T abl e guaranteed: 1.5V to 3.6V
2) V
from 0.8V to 2V at VCC = 3.0V
IN
DC SPECIFICATIONS
Supply Voltage (note 1)
CC
Input Voltage
I
Output Voltage (OFF State)
O
Output Voltage (High or Low State) 0 to V
O
, I
High or Low Level Output Current (VCC = 3.0 to 3.6V)
OL
, I
High or Low Level Output Current (VCC = 2.7V)
OL
Operating Temperature
op
Test Condition Value
2.0 to 3.6 V
0 to 5.5 V
0 to 5.5 V
CC
± 24 mA
± 12 mA
-55 to 125 °C
V
Symbol Parameter
V
V
V
V
I
I
OZ
IH
IL
OH
OL
I
I
off
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Leakage
Current
Power Off Leakage
Current
High Impedance
Output Leakage
Current
I
CC
∆I
Quiescent Supply
Current
ICC incr. per Input
CC
V
CC
(V)
2.7 to 3.6
2.7 to 3.6
2.7
3.0
2.7 to 3.6
2.7
3.0
2.7 to 3.6
0
2.7 to 3.6
2.7 to 3.6
2.7 to 3.6
-40 to 85 °C -55 to 125 °C
Min. Max. Min. Max.
2.0 2.0 V
0.8 0.8 V
IO=-100 µAVCC-0.2 VCC-0.2
I
=-12 mA
O
I
=-18 mA
O
I
=-24 mA
O
=100 µA
I
O
I
=12 mA
O
I
=16 mA
O
I
=24 mA
O
= 0 to 5.5V
V
I
V
or VO = 5.5V
I
= VIH or V
V
I
VO = 0 to V
VI = VCC or GND
V
or VO= 3.6 to 5.5V
I
VIH = VCC - 0.6V
IL
CC
2.2 2.2
2.4 2.4
2.2 2.2
0.2 0.2
0.4 0.4
0.4 0.4
0.55 0.55
± 5 ± 5 µA
10 10 µA
± 5 ± 5 µA
10 10
± 10 ± 10
500 500 µA
Unit
V
V
µA
3/9
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74LCX240
DYNAMIC SWITCHING CHARACTERISTICS
Test Condition Value
T
Symbol Parameter
V
OLP
V
OLV
1) Number of outputs d ef i ned as "n". Me asured with "n-1" output s switching from HIGH to LO W or LOW to HIGH. The remaini ng outpu t is
measur ed i n the LOW state.
Dynamic Low Level Quiet
Output (note 1)
V
3.3
CC
(V)
= 50pF
C
L
V
= 0V, VIH = 3.3V
IL
Min. Typ. Max.
AC ELECTRICAL CHARACTERISTICS
Test Condition Value
= 25 °C
A
0.8
-0.8
Unit
V
Symbol Parameter
V
CC
(V)
t
PLH tPHL
t
PZL tPZH
Propagation Delay
Time
2.7
3.0 to 3.6 1.5 6.5 1.5 7.5
Output Enable Time 2.7
3.0 to 3.6 1.5 8.0 1.5 9.2
t
PLZ tPHZ
Output Disable Time 2.7
3.0 to 3.6 1.5 7.0 1.5 8.3
t
OSLH
t
OSHL
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 (t
2) Param eter guaran te ed by design
Output To Output
Skew Time (note1,
2)
3.0 to 3.6 50 500 2.5 1.0 1.0 ns
OSLH
C
L
(pF)
50 500 2.5
50 500 2.5
50 500 2.5
= | t
PLHm
- t
PLHn
R
(Ω)
|, t
L
OSHL
t
s
(ns)
= t
= | t
-40 to 85 °C -55 to 125 °C
r
Min. Max. Min. Max.
1.5 7. 5 1.5 8.5
1.5 9. 0 1.5 10.5
1.5 8.0 1.5 9.2
- t
PHLn
|)
PHLm
Unit
ns
ns
ns
CAPACITIVE CHARACTERISTICS
Test Condition Value
T
Symbol Parameter
C
C
OUT
C
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. I
Input Capacitance
IN
Output Capacitance
Power Dissipation Capacitance
PD
(note 1)
V
CC
(V)
3.3
3.3
VIN = 0 to V
VIN = 0 to V
3.3 fIN = 10MHz
V
= 0 or V
IN
Min. Typ. Max.
CC
CC
CC
CC(opr)
= 25 °C
A
Unit
6pF
10 pF
40
= CPD x VCC x fIN + ICC/8 (per c ircuit )
pF
4/9
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TEST CIRCUIT
TEST SWITCH
t
, t
PLH
PHL
, t
t
PZL
PLZ
t
, t
PZH
PHZ
CL = 50 pF or equival ent (includes jig and probe capacitance)
R
= R1 = 500Ω or equivalent
L
= Z
R
of pulse generator (typically 50Ω)
T
OUT
74LCX240
Open
6V
GND
WAVEFORM 1 : PROPAGATION DELAYS (f=1MH z; 5 0% duty cycle )
5/9
Page 6
74LCX240
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
6/9
Page 7
SO-20 MECHANICAL DATA
74LCX240
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 2.65 0.104
a1 0.1 0.2 0.004 0.008
a2 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 0.75 0.029
S8° (max.)
mm. inch
PO13L
7/9
Page 8
74LCX240
TSSOP20 MECHANICAL DATA
mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 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
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
A2
A
A1
b
e
K
c
L
E
D
E1
PIN 1 IDENTIFICATION
8/9
1
0087225C
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74LCX240
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