MICREL SY89824L Datasheet
3.3V 1:22 HIGH-PERFORMANCE,
LO W VOL T A GE
BUS CLOCK DRIVER
ClockWorks™
SY89824L
FEATURES
■ 3.3V core supply, 1.8V output supply for reduced
power
■ LVPECL and HSTL inputs
■ 22 differential HSTL (low-voltage swing) output pairs
■ HSTL outputs drive 50Ω to ground with no offset
voltage
■ Low part-to-part skew (200ps max.)
■ Low pin-to-pin skew (50ps max.)
■ Available in a 64-Pin EPAD HQFP
PIN CONFIGURATION
6
30 31 32
V
CCO
CCO
48
V
CCO
47
Q
7
46
Q
7
45
Q
8
44
Q
8
43
Q
9
42
Q
9
41
Q
10
40
Q
10
39
Q
11
38
Q
11
37
Q
12
36
Q
12
35
Q
13
34
Q
13
33
V
CCO
V
CCO
NC
NC
V
CCI
HSTL_CLK
HSTL_CLK
CLK_SEL
LVPECL_CLK
LVPECL_CLK
GND
OE
NC
NC
Q
Q
V
CCO
V
CCO
Q1Q1Q2Q
Q0Q
0
61 60 59 58 57 56 55 54 53 52 51 50 49
626364
1
2
3
4
5
6
7
8
9
10
11
12
13
14
21
15
21
16
17 18 19 20 21 22 23 24 25 26 27 28 29
Q19Q19Q18Q
Q20Q
V
CCO
20
Q3Q3Q4Q
2
64-PIN
HQFP
Q17Q17Q16Q
18
Q5Q5Q6Q
4
Q15Q15Q14Q14V
16
DESCRIPTION
The SY89824L is a High Performance Bus Clock Driver
with 22 differential HSTL (High Speed Transceiver Logic)
output pairs. The part is designed for use in low voltage
(3.3V/1.8V) applications which require a large number of
outputs to drive precisely aligned, ultra low skew signals to
their destination. The input is multiplexed from either HSTL
or LVPECL (Low Voltage Positive Emitter Coupled Logic)
by the CLK_SEL pin. The Output Enable (OE) is
synchronous so that the outputs will only be enabled/
disabled when they are already in the LOW state. This
avoids any chance of generating a runt clock pulse when
the device is enabled/disabled as can happen with an
asynchronous control.
The SY89824L features low pin-to-pin skew (50ps max.)
and low part-to-part skew (200ps max.)—performance
previously unachievable in a standard product having such
a high number of outputs. The SY89824L is available in a
single space saving package, enabling a lower overall cost
solution.
PIN NAMES
Pin Function
HSTL_CLK, /HSTL_CLK Differential HSTL Inputs
LVPECL_CLK, /LVPECL_CLK Differential LVPECL Inputs
CLK_SEL Input CLK Select (LVTTL)
OE Output Enable (LVTTL)
Q0-Q21, /Q0-/Q21 Differential HSTL Outputs
GND Ground
VCCI VCC Core
CCO VCC Output
V
APPLICATIONS
■ High-performance PCs
■ Workstations
■ Parallel processor-based systems
■ Other high-performance computing
■ Communications
LOGIC SYMBOL
CLK_SEL
HSTL_CLK
HSTL_CLK
LVPECL_CLK
LVPECL_CLK
OE
1
0
22
Q0 - Q21
22
Q0 - Q21
1
LEN
Q
D
Rev.: C Amendment: /1
Issue Date:
March 2000
Micrel
ClockWorks™
SY89824L
TRUTH TABLE
(1)
OE
0 0 LOW HIGH
0 1 LOW HIGH
1 0 HSTL_CLK /HSTL_CLK
1 1 LVPECL_CLK /LVPECL_CLK
NOTE:
1. The OE (output enable) signal is synchronized with the low level of the
HSTL_CLK and LVPECL_CLK signal.
ABSOLUTE MAXIMUM RATINGS
CLK_SEL Q0-Q21 /Q0-/Q21
(1)
SIGNAL GROUPS
Level Direction Signal
HSTL Input HSTL_CLK, /HSTL_CLK
HSTL Output Q0-Q21, /Q0-/Q21
LVPECL Input LVPECL_CLK, /LVPECL_CLK
LVCMOS/LVTTL Input CLK_SEL, OE
Symbol Rating Value Unit
VCCI/VCCO VCC Pin Potential to Ground Pin –0.5 to +4.0 V
VIN Input Voltage –0.5 to VCCI V
IOUT DC Output Current (Output HIGH) –50 mA
Tstore Storage Temperature –65 to +150 °C
NOTE:
1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections of this data book. Exposure to ABSOLUTE MAXIMUM RATING conditions
for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
Power Supply
TA = 0°CTA = +25°CTA = +70°C
Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit
VCCI VCC Core 3.0 3.3 3.6 3.0 3.3 3.6 3.0 3.3 3.6 V
VCCO VCC Output 1.6 1.8 2.0 1.6 1.8 2.0 1.6 1.8 2.0 V
CCI ICC Core — 115 140 — 115 140 — 115 140 mA
I
HSTL
TA = 0°CTA = +25°CTA = +70°C
Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit
(1)
(1)
1.0 — 1.2 1.0 — 1.2 1.0 — 1.2 V
0 — 0.4 0 — 0.4 0 — 0.4 V
VOH Output HIGH Voltage
VOL Output LOW Voltage
VIH Input HIGH Voltage VX +0.1 — 1.6 VX +0.1 — 1.6 VX +0.1 — 1.6 V
VIL Input LOW Voltage –0.3 — VX –0.1 –0.3 — VX –0.1 –0.3 — VX –0.1 V
VX Input Crossover Voltage 0.68 — 0.9 0.68 — 0.9 0.68 — 0.9 V
IIH Input HIGH Current +20 —–350 +20 —–350 +20 —–350 µA
IL Input LOW Current ——–500 ——–500 ——–500 µA
I
NOTE:
1. Outputs loaded with 50Ω to ground.
2
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