Fairchild Semiconductor 74VCX162838MTDX, 74VCX162838MTD Datasheet
© 2000 Fairchild Semiconductor Corporation DS500045 www.fairchildsemi.com
August 1997
Revised July 2000
74VCX162838 Low Voltage 16-Bit Selectable Register/Buffer with 3. 6V Tolerant Inputs and Outputs and 26
Ω
Series Resistors in the Outputs
74VCX162838
Low Voltage 16-Bit Selectable Register/Buffer
with 3.6V Tolerant Inputs and Outputs
and 26
Ω Series Resistors in the Outputs
General Description
The VCX162838 con tains sixteen non-inverting selectable
buffered or registered pa ths. T he dev ic e can be c onfi g ur ed
to operate in a register ed, or flow throu gh buffer mode by
utilizing the register enable (REGE) and Clock (CP) signals. The device operates in a 16-bit word wide mode. All
outputs can be placed into 3-State thr ough the use of t he
OE
pin. These devices are i deally suited for buffered or
registered 168 pin and 200 pin SDRAM DIMM memory
modules.
The 74VCX162838 is designed for low v oltage (1.65V to
3.6V) V
CC
applications with I/O compatibility up to 3.6V.
The VCX162838 is also designed with 26
Ω series resistors
in the outputs. This de sign reduces line noise in applic ations such as memory address drivers, clock drivers, and
bus transceivers/transmitters.
The 74VCX162838 is fab ricated with an advance d CMOS
technology to achieve high speed operation while maintaining low CMOS power dissipation.
Features
■ Compatible with PC100 and PC133 DIMM module
specifications
■ 1.65V–3.6V V
CC
supply operation
■ 3.6V tolerant inputs and outputs
■ 26
Ω series resistors in the outputs
■ t
PD
(CP to On)
3.9 ns max for 3.0V to 3.6V V
CC
5.4 ns max for 2.3V to 2.7V VCC
9.8 ns max for 1.65V to 1.95V V
CC
■ Power-off high impedance inputs and outputs
■ Supports live insertion and withdrawal (Note 1)
■ Static Drive (I
OH/IOL
)
±12 mA @ 3.0V V
CC
±8 mA @ 2.3V V
CC
±3 mA @ 1.65V V
CC
■ Uses patented noise/EMI reductio n circuitr y
■ Latch-up performance exce eds 300 mA
■ ESD performance:
Human body model
> 2000V
Machine model
> 200V
Note 1: To ensure the high-impedance state d uring power up or power
down, OE
should be tied to VCC through a pull-up resistor. The minimum
value of the resistor is determined by the current -sourcing capability of the
driver.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol Pin Descriptions
Ordering Code Package Number Package Descriptions
74VCX162838MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Names Description
OE
Output Enable Input (Active LOW)
I
0–I15
Inputs
O
0–O15
Outputs
CP Clock Pulse Input
REGE Register Enable Input
www.fairchildsemi.com 2
74VCX162838
Connection Diagram Tr uth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial (HIGH or LOW, inputs may not float)
Z = High Impedance
Functional Description
The 74VCX162838 consists of sixteen selectable noninverting buffers or registers with word wide controls. Mode
functionality is sele cted through operation of the C P and
REGE pin as shown by the truth table. When REGE is held
at a logic “1” the device operates as a 16-bit r egist er. Data
is transferred from I
n
to On on the rising edge of the CP pin.
When the REGE pin is held at a logic “0” the device operates in a flow through mod e and data propagates dir ectly
from the I to the O out puts. All outputs ca n be 3- stated by
holding the OE
pin at a logic “1”.
Logic Diagram
Inputs Outputs
CP REGE
I
n
OE
O
n
↑ HHL H
↑ HLL L
XLHLH
XLLLL
XXXHZ
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74VCX162838
Absolute Maximum Ratings(Note 2) Recommended Operating
Conditions
(Note 4)
Note 2: The Absolute Maxi mum Ratings are those v alues beyond which
the safety of the dev ice cannot b e guaranteed . The device sh ould not be
operated at these limit s. The parametric values defi ned in the Electrical
Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operat ion.
Note 3: I
O
Absolute Maximum Rating must be observed.
Note 4: Floating or unused inputs must be held HIGH or LOW.
DC Electrical Characteristics (2.7V < VCC ≤ 3.6V)
Note 5: Outputs disabled or 3-STATE only.
Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
I
) −0.5V to +4.6V
Output Voltage (V
O
)
Outputs 3-STATE
−0.5V to +4.6V
Outputs Active (Note 3)
−0.5V to V
CC
+0.5V
DC Input Diode Current (I
IK
) VI < 0V −50 mA
DC Output Diode Current (I
OK
)
V
O
< 0V −50 mA
V
O
> V
CC
+50 mA
DC Output Source/Sink Current
(I
OH/IOL
) ±50 mA
DC V
CC
or GND Current per
Supply Pin (I
CC
or GND) ±100 mA
Storage Temperature Range (T
STG
) −65°C to +150°C
Power Supply
Operating 1.65V to 3.6V
Data Retention Only 1.2V to 3.6V
Input Voltage
−0.3V to +3.6V
Output Voltage (V
O
)
Output in Active States 0V to V
CC
Output in “OFF” State 0.0V to 3.6V
Output Current in I
OH/IOL
VCC = 3.0V to 3.6V ±12 mA
V
CC
= 2.3V to 2.7V ±8 mA
V
CC
= 1.65V to 2.3V ±3 mA
Free Air Operating Temperature (T
A
) −40°C to +85°C
Minimum Input Edge Rate (
∆t/∆V)
V
IN
= 0.8V to 2.0V, VCC = 3.0V 10 ns/V
Symbol Parameter Conditions
V
CC
(V)
Min Max Units
V
IH
HIGH Level Input Voltage 2.7–3.6 2.0 V
V
IL
LOW Level Input Voltage 2.7–3.6 0.8 V
V
OH
HIGH Level Output Voltage IOH = −100 µA2.7–3.6 VCC − 0.2 V
IOH = −6 mA 2.7 2.2 V
I
OH
= −8 mA 3.0 2.4 V
I
OH
= −12 mA 3.0 2.2 V
V
OL
LOW Level Output Voltage IOL = 100 µA2.7–3.6 0.2 V
I
OL
= 6 mA 2.7 0.4 V
I
OL
= 8 mA 3.0 0.55 V
IOL = 12 mA 3.0 0.8 V
I
I
Input Leakage Current 0 ≤ VI ≤ 3.6V 2.7–3.6 ±5.0 µA
I
OZ
3-STATE Output Leakage 0 ≤ VO ≤ 3.6V
2.7–3.6 ±10 µA
VI = VIH or V
IL
I
OFF
Power-OFF Leakage Current 0 ≤ (VI, VO) ≤ 3.6V 0 10 µA
I
CC
Quiescent Supply Current VI = VCC or GND 2.7–3.6 20 µA
VCC ≤ (VI, VO) ≤ 3.6V (Note 5) 2.7–3.6 ±20 µA
∆I
CC
Increase in ICC per Input VIH = VCC −0.6V 2.7–3.6 750 µA
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