CY2DP314
1 of 2:4 Differential Clock/Data Fanout Buffer
Features
• Four ECL/PECL differential outputs
• One ECL/PECL differential or single-ended inputs
(CLKA)
• One HSTL differential or single-ended inputs (CLKB)
• Hot-swappable/-insertable
Functional Description
The CY2DP314 is a low-skew, low propagation delay 2-to-4
differential fanout buffer targeted to meet the requirements of
high-performance clock and data distribution applications. The
device is implemented on SiGe technology and has a fully
differential internal architecture that is optimized to achieve
low signal skews at operating frequencies of up to 1.5 GHz (full
swing).
The device features two differential input paths that are multi-
plexed internally. This mux is controlled by the CLK_SEL pin.
The CY2DP314 may function not only as a differential clock
buffer but also as a signal-level translator and fanout on HSTL
or LVCMOS /LVTTL single-ended signal to four ECL/PECL
differential loads.
Since the CY2DP314 introduces negligible jitter to the timing
budget, it is the ideal choice for distributing high frequency,
high precision clocks across back-planes and boards in
communication systems. Furthermore, advanced circuit
design schemes, such as internal temperature compensation,
ensure that the CY2DP314 delivers consistent performance
over various platforms.
• 50-ps output-to-output skew
• 150-ps device-to-device skew
• 400-ps propagation delay (typical)
• 0.8-ps RMS period jitter (max.)
• 1.5-GHz operation (2.7-GHz maximum toggle
frequency)
• PECL and HSTL mode supply range: VCC = 2.5V± 5% to
3.3V±5% with VEE = 0V
• ECL mode supply range: VE E = –2.5V± 5% to –3.3V±5%
with VCC = 0V
• Industrial temperature range: –40°C to 85°C
• 20-pin SSOP package
• Temperature compensation like 100K ECL
Block Diagram
Pin Configuration
Q0
VCC
Q0#
20
19
18
17
16
15
14
13
12
11
VCC
Q0
Q0#
Q1
Q1#
Q2
Q2#
Q3
Q3#
VCC
NC
VCC
CLK_SEL
CLKA
CLKA#
CLKB
CLKB#
VEE
1
CLKA
2
CLKA#
Q1
3
Q1#
4
VEE
VCC
5
Q2
6
Q2#
CLKB
7
CLKB#
8
Q3
Q3#
9
VEE
CLK_SEL
10
VCC
VCC
20 pin SSOP
VEE
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose, CA 95134
•
408-943-2600
Document #: 38-07550 Rev.*E
Revised September 27, 2004