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PDF 74VCX16839 Data sheet ( Hoja de datos )
| Número de pieza | 74VCX16839 | |
| Descripción | Low Voltage 20-Bit Selectable Register/Buffer with 3.6V Tolerant Inputs and Outputs | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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July 1997
Revised April 1999
74VCX16839
Low Voltage 20-Bit Selectable Register/Buffer with 3.6V
Tolerant Inputs and Outputs
General Description
The VCX16839 contains twenty non-inverting selectable
buffered or registered paths. The device can be configured
to operate in a registered, or flow through buffer mode by
utilizing the register enable (REGE) and Clock (CP) sig-
nals. The device operates in a 20-bit word wide mode. All
outputs can be placed into 3-STATE through use of the OE
pin. These devices are ideally suited for buffered or regis-
tered 168 pin and 200 pin SDRAM DIMM memory mod-
ules.
The 74VCX16839 is designed for low voltage (1.65V to
3.6V) VCC applications with I/O compatibility up to 3.6V.
The 74VCX16839 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s Compatible with PC100 and PC133 DIMM module
specifications
s 1.65V–3.6V VCC supply operation
s 3.6V tolerant inputs and outputs
s tPD (CP to On)
3.2 ns max for 3.0V to 3.6V VCC
4.4 ns max for 2.3V to 2.7V VCC
8.8 ns max for 1.65V to 1.95V VCC
s Power-off high impedance inputs and outputs
s Supports live insertion and withdrawal (Note 1)
s Static Drive (IOH/IOL)
±24 mA @ 3.0V VCC
±18 mA @ 2.3V VCC
±6 mA @ 1.65V VCC
s Uses patented noise/EMI reduction circuitry
s Latch-up performance exceeds 300 mA
s ESD performance:
Human body model > 2000V
Machine model > 200V
Note 1: To ensure the high-impedance state during 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:
Order Number Package Number
Package Descriptions
74VCX16839MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
OE
I0–I19
O0–O19
CP
REGE
Description
Output Enable Input (Active LOW)
Inputs
Outputs
Clock Pulse Input
Register Enable Input
© 1999 Fairchild Semiconductor Corporation DS500105.prf
www.fairchildsemi.com
1 page  
AC Electrical Characteristics VCX16839 (Note 8)
TA = −40°C to +85°C, CL = 30 pF, RL = 500Ω
Symbol
Parameter
VCC = 3.3V ± 0.3V
VCC = 2.5V ± 0.2V
VCC = 1.8V ± 0.15V
Units
Min Max Min Max Min Max
fMAX
Maximum Clock Frequency
250
200
100 MHz
tPHL Prop Delay In to On
0.8 2.5 1.0 3.5 1.5 7.0 ns
tPLH (REGE = 0)
tPHL Prop Delay CP to On
0.8 3.2 1.0 4.4 1.5 8.8 ns
tPLH (REGE = 1)
tPHL, tPLH Prop Delay REGE to On
0.8 4.0 1.0 5.0 1.5 9.8 ns
tPZL, tPZH Output Enable Time
0.8 3.8 1.0 4.9 1.5 9.8 ns
tPLZ, tPHZ Output Disable Time
0.8 3.7 1.0 4.2 1.5 7.6 ns
tS Setup Time
1.0 1.0 2.5
ns
tH Hold Time
0.7 0.7 1.0
ns
tW Pulse Width
1.5 1.5 4.0 ns
tOSHL
Output to Output Skew
0.5 0.5 0.75 ns
tOSLH
(Note 9)
Note 8: For CL = 50 PF, add approximately 300 ps to the AC maximum specification.
Note 9: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH).
Extended AC Electrical Characteristics (Note 10)
Symbol
Parameter
tPHL, tPLH Prop Delay In to On (REGE = 0)
tPHL, tPLH Prop Delay CP to On (REGE = 1)
tPHL, tPLH Prop Delay REGE to On
tPZL, tPZH Output Enable Time
tPLZ, tPHZ Output Disable Time
tS Setup Time
tH Hold Time
Note 10: This parameter is guaranteed by characterization but not tested.
TA = −0°C to +85°C, RL = 500Ω VCC = 3.3V ± 0.3V
CL = 50 pF
Min Max
1.0 2.8
1.4 3.5
1.0 4.3
1.0 4.1
1.0 4.0
1.0
0.7
Units
ns
ns
ns
ns
ns
ns
ns
Dynamic Switching Characteristics
Symbol
Parameter
VOLP
Quiet Output Dynamic Peak VOL
VOLV
Quiet Output Dynamic Valley VOL
VOHV
Quiet Output Dynamic Valley VOH
Conditions
CL = 30 pF, VIH = VCC, VIL = 0V
CL = 30 pF, VIH = VCC, VIL = 0V
CL = 30 pF, VIH = VCC, VIL = 0V
VCC TA = +25°C Units
(V) Typical
1.8 0.25
2.5 0.6
V
3.3 0.8
1.8 −0.25
2.5 −0.6
V
3.3 −0.8
1.8 1.5
2.5 1.9
V
3.3 2.2
Capacitance
Symbol
Parameter
CIN
COUT
CPD
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Conditions
VCC = 1.8V, 2.5V or 3.3V, VI = 0V or VCC
VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V
VI = 0V or VCC, f = 10 MHz,
VCC = 1.8V, 2.5V or 3.3V
TA = +25°C
Typical
6
7
20
Units
pF
pF
pF
5 www.fairchildsemi.com
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