Fairchild Semiconductor 74VHC244MSCX, 74VHC244M, 74VHC244CW, 74VHC244SJX, 74VHC244SJ Datasheet
...
November 1992
Revised April 1999
74VHC244 Octal Buffer/Line Driver with 3-STATE Outputs
© 1999 Fairchild Semiconductor Corporation DS011522.prf www.fairchildsemi.com
74VHC244
Octal Buffer/Line Driver with 3-ST ATE Outputs
General Description
The VHC244 is an advanced high sp eed CMOS octal b us
buffer fabricated with silicon gate CMOS technology. It
achieves high speed operation similar to equivalent Bipolar
Schottky TTL while maintaining the CMOS low power dissipation. The VHC244 is a non-inverting 3-STATE buffer having two active-LOW output enables. These devices are
designed to be used as 3-STATE memory address drivers,
clock drivers, and bus oriented transmitter/receivers.
An input protection circuit en sures that 0V to 7V can be
applied to the input pins without re gard to the supply voltage. This device can be used to interface 5V to 3V systems
and two supply systems such as bat tery back up. This cir-
cuit prevents device destruction due to m isma tche d supply
and input voltages.
Features
■ High Speed: tPD = 3.9ns (typ) at VCC = 5V
■ High noise immunity: V
NIH
= V
NIL
= 28% VCC (min)
■ Power down protection is provided on all inputs
■ Low noise: V
OLP
= 0.6V (typ)
■ Low power dissipation: I
CC
= 4 µA (max) @ TA = 25°C
■ Pin and function compatible with 74HC244
Ordering Code:
Surface mount pack ages are also available on Tape and Reel. Specify by appending the s uffix let te r “X” to the ordering code.
Logic Symbol
IEEE/IEC
Connection Diagram
Pin Descriptions
Order Number Package Number Package Description
74VHC244M M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74VHC244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHC244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHC244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Pin Names Description
OE
1
, OE
2
3-STATE Output Enable Inputs
I
0–I7
Inputs
O
0–O7
3-STATE Outputs
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74VHC244
Truth Tables
H = HIGH Voltage Level
L = LOW Voltage Level
I = Immaterial
Z = High Impedance
Inputs Outputs
OE
1
I
n
(Pins 12, 14, 16, 18)
LL L
LH H
HX Z
Inputs Outputs
OE
2
I
n
(Pins 3, 5, 7, 9)
LL L
LH H
HX Z
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74VHC244
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 2)
Note 1: Absolute Maximum Ratings are valu es beyond whic h the device
may be damaged or ha ve its useful life impaire d. The datab ook specifications should be met, without exception, to ensure that the system design is
reliable over its p ower supp ly, temperature, and o utput/input loading variables. Fairchild does not recommend operation outside databook specifications.
Note 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Noise Characteristics
Note 3: Parameter gu aranteed by design.
Supply Voltage (VCC) −0.5V to +7.0V
DC Input Voltage (V
IN
) −0.5V to +7.0V
DC Output Voltage (V
OUT
) −0.5V to VCC + 0.5V
Input Diode Current (I
IK
) −20 mA
Output Diode Current (I
OK
) ±20 mA
DC Output Current (I
OUT
) ±25 mA
DC V
CC
/GND Current (ICC) ±75 mA
Storage Temperature (T
STG
) −65°C to +150°C
Lead Temperature (T
L
)
(Soldering, 10 seco nds) 260°C
Supply Voltage (V
CC
) 2.0V to 5.5V
Input Voltage (V
IN
)0V to +5.5V
Output Voltage (V
OUT
)0V to V
CC
Operating Temperature (T
OPR
) −40°C to +85°C
Input Rise and Fall Time (t
r
, tf)
V
CC
= 3.3V ± 0.3V 0 ns/V ∼ 100 ns/V
V
CC
= 5.0V ± 0.5V 0 ns/V ∼ 20 ns/V
Symbol Parameter
V
CC
(V)
TA = 25°CT
A
= −40°C to +85°C
Units Conditions
Min Typ Max Min Max
V
IH
HIGH Level 2.0 1.5 1.5
V
Input Voltage 3.0 − 5.5 0.7 V
CC
0.7 V
CC
V
IL
LOW Level 2.0 0.5 0.5
V
Input Voltage 3.0 − 5.5 0.3 V
CC
0.3 V
CC
V
OH
HIGH Level 2.0 1.9 2.0 1.9 VIN = VIHIOH = −50 µA
Output Voltage 3.0 2.9 3.0 2.9 V or V
IL
4.5 4.4 4.5 4.4
3.0 2.58 2.48
V
IOH = −4 mA
4.5 3.94 3.80 IOH = −8 mA
V
OL
LOW Level 2.0 0.0 0.1 0.1 VIN = VIHIOL = 50 µA
Output Voltage 3.0 0.0 0.1 0.1 V or V
IL
4.5 0.0 0.1 0.1
3.0 0.36 0.44
V
IOL = 4 mA
4.5 0.36 0.44 IOL = 8 mA
I
OZ
3-STATE Output 5.5 ±0.25 ±2.5 µAVIN = VIH or V
IL
Off-State Current V
OUT
= VCC or GND
I
IN
Input Leakage Current 0 − 5.5 ±0.1 ±1.0 µAVIN = 5.5V or GND
I
CC
Quiescent Supply Current 5.5 4.0 40.0 µAVIN = VCC or GND
Symbol Parameter
V
CC
(V)
TA = 25°C
Units Conditions
Typ Limits
V
OLP
Quiet Output Maximum 5.0 0.6 0.9 V CL = 50 pF
(Note 3) Dynamic V
OL
V
OLV
Quiet Output Minimum 5.0 −0.6 −0.9 V CL = 50 pF
(Note 3) Dynamic V
OL
V
IHD
Minimum HIGH Level 5.0 3.5 V CL = 50 pF
(Note 3) Dynamic Input Voltage
V
ILD
Maximum HIGH Level 5.0 1.5 V CL = 50 pF
(Note 3) Dynamic Input Voltage
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