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National Semiconductor Electronic Components Datasheet

SCAN921821 Datasheet

Dual 18-Bit Serializer

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November 2004
www.DataSheet4U.com
SCAN921821
Dual 18-Bit Serializer with Pre-emphasis, IEEE 1149.1
(JTAG), and At-Speed BIST
General Description
The SCAN921821 is a dual channel 18-bit serializer featur-
ing signal conditioning, boundary SCAN, and at-speed BIST.
Each serializer block transforms an 18-bit parallel LVCMOS/
LVTTL data bus into a single Bus LVDS data stream with
embedded clock. This single serial data stream with embed-
ded clock simplifies PCB design and reduces PCB cost by
narrowing data paths that in turn reduce PCB size and
layers. The single serial data stream also reduces cable
size, the number of connectors, and eliminates clock-to-data
and data-to-data skew.
Each channel also has an 8-level selectable pre-emphasis
feature that significantly extends performance over lossy
interconnect. Each channel also has its own powerdown pin
that saves power by reducing supply current when the chan-
nel is not being used.
The SCAN921821 also incorporates advanced testability
features including IEEE 1149.1 and at-speed BIST PRBS
pattern generation to facilitate verification of board and link
integrity
Features
n 15-66 MHz Dual 18:1 Serializer with 2.376 Gbps total
throughput
n 8-level selectable pre-emphasis on each channel drives
lossy cables and backplanes
n >15kV HBM ESD protection on Bus LVDS I/O pins
n Robust BLVDS serial data transmission with embedded
clock for exceptional noise immunity and low EMI
n Power saving control pin for each channel
n IEEE 1149.1 "JTAG" Compliant
n At-Speed BIST - PRBS generation
n No external coding required
n Internal PLL, no external PLL components required
n Single +3.3V power supply
n Low power: 260 mW (typ) per channel at 66 MHz with
PRBS-15 pattern
n Single 3.3 V supply
n Fabricated with advanced CMOS process technology
n Industrial −40 to +85˚C temperature range
n Compact 100-ball FBGA package
Block Diagram
© 2004 National Semiconductor Corporation DS200844
20084401
www.national.com


National Semiconductor Electronic Components Datasheet

SCAN921821 Datasheet

Dual 18-Bit Serializer

No Preview Available !

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VDD)
Supply Voltage (VDD)
Ramp Rate
−0.3V to +4V
< 30 V/ms
LVCMOS/LVTTL Input
Voltage
LVCMOS/LVTTL Output
−0.3V to (VDD +0.3V)
Voltage
Bus LVDS Driver Output
−0.3V to (VDD +0.3V)
Voltage
−0.3V to +3.9V
Bus LVDS Output Short
Circuit Duration
10ms
Junction Temperature
+150˚C
Storage Temperature
−65˚C to +150˚C
Lead Temperature
(Soldering, 4 seconds)
+220˚C
Maximum Package Power Dissipation at 25˚C
FBGA-100
3.57 W
Derating Above 25˚C
Thermal resistance θJA
θJC
ESD Rating
HBM, 1.5 K, 100 pF
All pins
Bus LVDS pins
MM, 0, 200 pF
CDM
28.57 mW/˚C
www.DataShee3t54˚UC./cWom
11.1˚C/W
>8 kV
>15 kV
>1200 V
>2 kV
Recommended Operating
Conditions
Supply Voltage (VDD)
Operating Free Air
Temperature (TA)
Clock Rate
Supply Noise
Min Nom Max
3.15 3.3 3.45
−40 +25 +85
15 66
100
Units
V
˚C
MHz
mV p-p
DC Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
LVCMOS/LVTTL Input DC Specifications
High Level Input
VIH Voltage
2.0
VDD
V
Low Level Input
VIL Voltage
GND
0.8 V
VCL Input Clamp Voltage
High Level Input
IINH Current
ICL = −18 mA
VIN = VDD = VDDMAX
−1.5
-0.7
−20 ±2 +20
V
µA
Low Level Output
IINL Current
VIN = VSS, VDD = VDDMAX
−10 ±2 +10 µA
1149.1 (JTAG) DC Specifications
High Level Input
VIH Voltage
2.0
VDD
V
Low Level Input
VIL Voltage
GND
0.8 V
VCL Input Clamp Voltage
High Level Input
IINH Current
ICL = −18 mA
VIN = VDD = VDDMAX
−1.5
-0.7
-20 +20
V
µA
Low Level Output
IINL Current
VIN = VSS, VDD = VDDMAX
-200
+200
µA
High Level Output
VOH
Voltage
IOH = −9 mA
2.3
VDD
mV
Low Level Output
VOL Voltage
IOL = 9 mA
GND
0.5 mV
Output Short Circuit
IOS Current
VOUT = 0 V
-100
-80
-50
mA
Output Tri-state
IOZ Current
PWDN or EN = 0.8V, VOUT = 0 V
PWDN or EN = 0.8V, VOUT = VDD
-10
-30
+10 µA
+30 µA
www.national.com
2


Part Number SCAN921821
Description Dual 18-Bit Serializer
Maker National Semiconductor
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SCAN921821 Datasheet PDF






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