1
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
Pin Function
SIN, SIN Differential Serial Data Input
D0 – D3Parallel Data Input
SOUT, SOUT Differential Serial Data Output
CLK, CLK Differential Clock Input
CL/4, CL/4 Differential 4 Clock Output
CL/8, CL/8 Differential 8 Clock Output
MODE Conversion Mode, 4-bit/8-bit
SYNC Conversion Synchronizing Input
VCCO VCC to Output
DESCRIPTION
FEATURES
■On-chip clock ÷4 and ÷8
■Extended 100E VEE range of –4.2V to –5.5V
■1.6Gb/s typical data rate capability
■Differential clock and serial inputs
■VBB output for single-ended use
■Asynchronous data synchronization
■Mode select to expand to 8 bits
■Internal 75KΩ input pulldown resistors
■Fully compatible with Motorola MC10E/100E446
■Available in 28-pin PLCC package
4-BIT PARALLEL-TO-SERIAL
CONVERTER
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 D0 to D3. 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 VBB 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
VBB pin is tied to the inverting differential input and
bypassed via a 0.01µF capacitor. The VBB provides the
switching reference for the input differential amplifier. The
VBB can also be used to AC couple an input signal.
SY10E446
SY100E446
PIN NAMES
Rev.: F Amendment: /0
Issue Date:
March 2006
2
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
Package Operating Package Lead
Part Number Type Range Marking Finish
SY10E446JC J28-1 Commercial SY10E446JC Sn-Pb
SY10E446JCTR(2) J28-1 Commercial SY10E446JC Sn-Pb
SY100E446JC J28-1 Commercial SY100E446JC Sn-Pb
SY100E446JCTR(2) J28-1 Commercial SY100E446JC Sn-Pb
SY10E446JZ(3) J28-1 Commercial SY10E446JZ with Matte-Sn
Pb-Free bar-line indicator Pb-Free
SY10E446JZTR(2, 3) J28-1 Commercial SY10E446JZ with Matte-Sn
Pb-Free bar-line indicator Pb-Free
SY100E446JZ(3) J28-1 Commercial SY100E446JZ with Matte-Sn
Pb-Free bar-line indicator Pb-Free
SY100E446JZTR(2, 3) J28-1 Commercial SY100E446JZ with Matte-Sn
Pb-Free bar-line indicator Pb-Free
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only.
2. Tape and Reel.
28-Pin PLCC (J28-1)
18
17
16
15
14
13
12
567891011
26
27
28
1
2
3
4
TOP VIEW
PLCC
J28-1
25 24 23 22 21 20 19
D2
D3
MODE
NC
D0
D1
NC
CLK
VBB
VEE
SIN
SYNC
CLK
SIN
VCCO
CL/8
VCCO
CL/4
VCCO
CL/8
CL/4
NC
NC
VCC
SOUT
VCCO
NC
SOUT
3
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
BLOCK DIAGRAM
DQ
CLK
DQ
CLK
DQ
CLK
DQ
CLK
0
1
SIN
SIN
D3
0
1
0
1
0
1
D2
D1
D0
SOUT
SOUT
01
MODE
CLK
CLK DELAY ÷4
R
÷8
R
CL/8
CL/8
SYNC
CL/4
CL/4
VBB
4
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
TA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Condition
fMAX Max. Conversion Frequency 1.3 1.6 —1.3 1.6 —1.3 1.6 —Gb/s —
NRZ
tPD Propagation Delay to Output ps —
CLK to SOUT 1000 1400 1700 1000 1400 1700 1000 1400 1700
CLK to CL/4 500 800 1100 500 800 1100 500 800 1100
CLK to CL/8 800 1100 1400 800 1100 1400 800 1100 1400
SYNC to CL/4, CL/8 500 800 1100 500 800 1100 500 800 1100
tSSet-up Time ps —
SIN –200 –400 —–200 –400 —–200 –400 —
Dn–200 –400 —–200 –400 —–200 –400 —
Mode 0 –250 —0–250 —0–250 —
tHHold Time ps —
SIN 750 550 —750 550 —750 550 —
Dn800 600 —800 600 —800 600 —
Mode 500 300 —500 300 —500 300 —
tRR Reset Recovery Time 500 200 —500 200 —500 200 —ps —
tPW Minimum Pulse Width 400 ——400 ——400 ——ps —
CLK, MR
trRise/Fall Time ps 20–80%
tfSOUT 100 225 350 100 225 350 100 225 350
Other 200 425 650 200 425 650 200 425 650
AC ELECTRICAL CHARACTERISTICS
VEE = VEE (Min.) to VEE (Max.); VCC = VCCO = GND
DC ELECTRICAL CHARACTERISTICS
VEE = VEE (Min.) to VEE (Max.); VCC = VCCO = GND
TA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit Condition
IIH Input HIGH Current ——150 ——150 ——150 µA—
VOH Output HIGH Voltage V1
(SOUT Only) 10E –1020 —–790 –980 —–760 –910 —–670
(SOUT Only) 100E –1025 —–830 –1025 —–830 –1025 —–830
VBB Output Reference Voltage V—
10E –1.38 —–1.27 –1.35 —–1.25 –1.31 —–1.19
100E –1.38 —–1.26 –1.38 —–1.26 –1.38 —–1.26
IEE Power Supply Current mA —
10E —110 132 —110 132 —110 132
100E —110 132 —110 132 —127 152
Note:
1. The maximum VOH limit was relaxed from standard ECL due to the high frequency output design. All other outputs are specified with the standard 10E
and 100E VOH levels.
TRUTH TABLE
Mode Conversion
L 4-Bit
H 8-Bit
5
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
TIMING DIAGRAMS
CLK
RESET
D0
D1
D2
D3
SOUT
CL/4
CL/8
D0–1
D1–1
D2–1
D3–1
Timing Diagram A. 4:1 Parallel-to-Serial Conversion
6
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
TIMING DIAGRAMS (CONTINUED)
Timing Diagram B. 8:1 Parallel-to-Serial Conversion
CLK
RESET
D
0
D
1
D
2
D
3
SOUT
D
0–1
D
1–1
D
2–1
D
3–1
D
4
(D
0B
)D
4–1
D
5–1
D
6–1
D
7–1
D
5(
D
1B
)
D
6
(D
2B
)
D
7(
D
3B
)
7
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
APPLICATIONS INFORMATION
The SY10E/100E446 are integrated 4:1 parallel-to-serial
converters. The chips are designed to work with the E445
device to provide both transmission and receiving of a high-
speed serial data path. The E446 can convert 4 bits of
data into a 1.3Gb/s NRZ data stream. The device features
a SYNC input which allows the user to reset the internal
clock circuitry and restart the conversion sequence (see
Timing Diagram A). Note that SOUT is triggered by negative
clock edges.
The E446 features a differential serial input and internal
divide-by-eight circuitry to facilitate the cascading of two
devices to build an 8:1 multiplexer. Figure 1 illustrates the
architecture for an 8:1 multiplexer using two E446s (see
Timing Diagram B). Notice the serial outputs (SOUT) of the
lower order converter feed the serial inputs of the higher
order device. This feed through of the serial inputs bounds
the upper end of the frequency of operation. The clock-to-
serial output propagation delay, plus the set-up time of the
serial input pins, must fit into a single clock period for the
cascade architecture to function properly. Using the worst
case values for these two parameters from the data sheet,
tPD CLK to SOUT = 1600ps and ts for SIN = –200ps, yields
a minimum period of 1400ps or a clock frequency of
700MHz.
The clock frequency is somewhat lower than that of a
single converter. In order to increase this frequency, it is
recommended that the clock edge feeding the E446A be
delayed with respect to the E446B, as shown in Figure 2.
Perhaps the easiest way to delay the second clock relative
to the first is to take advantage of the differential clock
inputs of the E446. By connecting the clock for E446A to
the complimentary clock input pin, the device will clock a
half a clock period after E446B (Figure 2). Utilizing this
simple technique will raise the potential conversion frequency
up to the maximum 1.3GHz of a stand-alone E446.
Figure 1. Cascaded 8:1 Converter Architecture
E446B
SOUT
SOUT
D
3
D
2
D
1
D
0
D
7
D
6
D
5
D
4
E446A
SOUT
SOUT
D
3
D
2
D
1
D
0
D
3
D
2
D
1
D
0
SIN
SIN
CLK
CLK
SERIAL
DATA
PARALLEL DATA
1400ps 200ps
CLK
t
PD
CLK to SOUT 1600ps
8
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
APPLICATIONS INFORMATION
Figure 2. Extended Frequency 8:1 Converter Architecture
E446B
SOUT
SOUT
D
3
D
2
D
1
D
0
D
7
D
6
D
5
D
4
E446A
SOUT
SOUT
D
3
D
2
D
1
D
0
D
3
D
2
D
1
D
0
SIN
SIN
CLK
CLK
SERIAL
DATA
PARALLEL DATA
770ps
CLKB
CLKA
t
PD
CLK to SOUT
1.3GHz
9
SY10E446
SY100E446
Micrel, Inc.
M9999-032206
hbwhelp@micrel.com or (408) 955-1690
28-PIN PLCC (J28-1)
Rev. 03
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.
