Micrel, Inc.
4-BIT PARALLEL-TO-SERIAL
CONVERTER
SY10E446
SY100E446
SY10E446
SY100E446
FEATURES
s
On-chip clock
÷
4 and
÷
8
s
Extended 100E V
EE
range of –4.2V to –5.5V
s
s
s
s
1.6Gb/s typical data rate capability
Differential clock and serial inputs
VBB output for single-ended use
Asynchronous data synchronization
DESCRIPTION
The SY10/100E446 are integrated 4-bit parallel-to-
serial data converters. These devices are designed to
operate for NRZ data rates of up to a minimum of 1.3Gb/
s. The chips generate a divide-by-4 and a divide-by-8
clock for both 4-bit conversion and a two-chip 8-bit
conversion function. The conversion sequence was
chosen to convert the parallel data into a serial stream
from bit D
0
to D
3
. A serial input is provided to cascade
two E446 devices for 8-bit conversion applications.
The SYNC input will asynchronously reset the internal
clock circuitry. This pin allows the user to reset the internal
clock conversion unit and, thus, select the start of the
conversion process.
The MODE input is used to select the conversion mode
of the device. With the MODE input LOW (or open) the
device will function as a 4-bit converter. When the mode
input is driven HIGH, the internal load clock will change
on every eighth clock cycle, thus allowing for an 8-bit
conversion scheme using two E446s. When cascaded in
an 8-bit conversion scheme, the devices will not operate
at the 1.3Gb/s data rate of a single device. Refer to the
applications section of this data sheet for more information
on cascading the E446.
For lower data rate applications, a V
BB
reference
voltage is supplied for single-ended inputs. When
operating at clock rates above 500MHz, differential input
signals are recommended. For single-ended inputs, the
V
BB
pin is tied to the inverting differential input and
bypassed via a 0.01µF capacitor. The V
BB
provides the
switching reference for the input differential amplifier. The
V
BB
can also be used to AC couple an input signal.
s
Mode select to expand to 8 bits
s
Internal 75K
Ω
input pulldown resistors
s
Fully compatible with Motorola MC10E/100E446
s
Available in 28-pin PLCC package
PIN NAMES
Pin
SIN, SIN
D
0
– D
3
SOUT, SOUT
CLK, CLK
CL/4, CL/4
CL/8, CL/8
MODE
SYNC
V
CCO
Function
Differential Serial Data Input
Parallel Data Input
Differential Serial Data Output
Differential Clock Input
Differential 4 Clock Output
Differential 8 Clock Output
Conversion Mode, 4-bit/8-bit
Conversion Synchronizing Input
V
CC
to Output
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
1
Rev.: F
Amendment: /0
Issue Date: March 2006
Micrel, Inc.
SY10E446
SY100E446
PACKAGE/ORDERING INFORMATION
MODE
NC
Ordering Information
(1)
NC
D
0
D
1
D
2
D
3
Part Number
25 24 23 22 21 20 19
Package
Type
J28-1
J28-1
J28-1
J28-1
J28-1
J28-1
J28-1
J28-1
Operating
Range
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Commercial
Package
Marking
SY10E446JC
SY10E446JC
SY100E446JC
SY100E446JC
SY10E446JZ with
Pb-Free bar-line indicator
SY10E446JZ with
Pb-Free bar-line indicator
SY100E446JZ with
Pb-Free bar-line indicator
SY100E446JZ with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Sn-Pb
Sn-Pb
Matte-Sn
Pb-Free
Matte-Sn
Pb-Free
Matte-Sn
Pb-Free
Matte-Sn
Pb-Free
SY10E446JC
18
17
CLK
CLK
V
BB
V
EE
SIN
SIN
SYNC
26
27
28
1
2
3
4
5
6
7
8
9
10 11
NC
NC
V
CC
SOUT
SOUT
V
CCO
NC
SY10E446JCTR
(2)
SY100E446JC
SY100E446JCTR
(2)
SY10E446JZ
(3)
SY10E446JZTR
(2, 3)
SY100E446JZ
(3)
SY100E446JZTR
(2, 3)
TOP VIEW
PLCC
J28-1
16
15
14
13
12
V
CCO
CL/8
28-Pin PLCC (J28-1)
V
CCO
CL/4
CL/4
V
CCO
CL/8
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
2
RF/Wirelessly
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