Micrel SY10EL15, SY100EL15 User Manual

查询SY100EL15供应商

FEATURES

■ 50ps output-to-output skew

■ Synchronous enable/disable

■ Multiplexed clock input

■ 75KΩ internal input pull-down resistors

■ Available in 16-pin SOIC package

PIN CONFIGURATION/BLOCK DIAGRAM

EN

CC

V

16 15 14 13 12 11 10 9

D
Q

2

1

0Q0

Q

CLK

SCLK

1 0

34567

Q

Q

1

1

SOIC

TOP VIEW

CLK

Q

BB

V

2

Q

2

SEL

Q

V

EE

8

3

3

Q

1:4 CLOCK
DISTRIBUTION

DESCRIPTION

The SY10/100EL15 are low skew 1:4 clock distribution
chips designed explicitly for low skew clock distribution
applications. The device can be driven by either a
differential or single-ended ECL or, if positive power
supplies are used, PECL input signal. If a single-ended
input is to be used the VBB output should be connected
to the CLK input and bypassed to VCC via a 0.01µF
capacitor. The VBB output is designed to act as the
switching reference for the input of the EL15 under single­ended input conditions, as a result this pin can only
source/sink up to 0.5mA of current.

The EL15 features a multiplexed clock input to allow
for the distribution of a lower speed scan or test clock
along with the high speed system clock. When LOW (or
left open and pulled LOW by the input pull-down resistor)
the SEL pin will select the differential clock input.

The common enable (EN) 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 internal flip flop is clocked on the falling edge of the
input clock, therefore all associated specification limits
are referenced to the negative edge of the clock input.

Precision Edge™

SY10EL15

SY100EL15

FINAL

Precision Edge™

Pin Function

CLK Differential Clock Inputs
SCLK Synchronous Clock Input
EN Synchronous Enable
SEL Clock Select Input
VBB Reference Output
Q0-3 Differential Clock Outputs

Precision Edge is a trademark of Micrel, Inc.

TRUTH TABLEPIN NAMES

CLK SCLK SEL EN Q

L XLLL
HXLLH
XLHLL
XHHLH
XXXHL*

* On next negative transition of CLK or SCLK

1

Rev.: G Amendment: /0
Issue Date:

February 2003

Micrel

Precision Edge™

SY10EL15

SY100EL15

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Rating Value Unit

VEE Power Supply (VCC = 0V) –8.0 to 0 VDC
VI Input Voltage (VCC = 0V) 0 to –6.0 VDC

OUT Output Current

I

–Continuous 50 mA

–Surge 100
TA Operating Temperature Range –40 to +85 °C
V

EE Operating Range

NOTES:

1. Absolute maximum rating, beyond which, device life may be impaired, unless otherwise specified on an individual data sheet.

2. Parametric values specified at: 100EL15 Series: –4.2V to –5.5V.

(1),(2)

10EL15 Series –4.75V to –5.5V.

–5.7 to –4.2 V

10EL DC ELECTRICAL CHARACTERISTICS

VEE = VEE (Min.) to VEE (Max.); VCC = GND

Symbol Parameter Min. Max. Min. Max. Min. Typ. Max. Min. Max. Unit

VOH Output HIGH Voltage –1080 –890 –1020 –840 –980 — –810 –910 –720 mV
VOL Output LOW Voltage –1950 –1650 –1950 –1630 –1950 — –1630 –1950 –1595 mV
VIH Input HIGH Voltage –1230 –890 –1170 –840 –1130 — –810 –1060 –720 mV
VIL Input LOW Voltage –1950 –1500 –1950 –1480 –1950 — –1480 –1950 –1445 mV
IIH Input High Current — 150 — 150 — — 150 — 150 µA
IIL Input LOW Current 0.5 — 0.5 — 0.5 — — 0.5 — µA
IEE Power Supply Current — 35 — 35 — 25 35 — 38 mA

BB Output Reference Voltage –1.38 –1.26 –1.38 –1.26 –1.38 — –1.26 –1.38 –1.26 V

V

NOTE:

1. 10EL circuits are designed to meet the DC specifications shown in the table after thermal equilibrium has been established. The circuit is in a test socket
or mounted on a printed circuit board and transverse airflow greater than 500lfpm is maintained. Outputs are terminated through a 50Ω resistor to –2.0V
except where otherwise specified on the individual data sheets.

(1)

TA = –40°CTA = 0°CTA = +25°CTA = +85°C

PRODUCT ORDERING CODE

Ordering Package Operating Marking

Code Type Range Code

SY10EL15ZC Z16-2 Commercial HEL15
SY10EL15ZCTR* Z16-2 Commercial HEL15
SY100EL15ZC Z16-2 Commercial XEL15
SY100EL15ZCTR* Z16-2 Commercial XEL15

*Tape and Reel

Note 1. Recommended for new designs.

Ordering Package Operating Marking

Code Type Range Code

SY10EL15ZI
SY10EL15ZITR*
SY100EL15ZI
SY100EL15ZITR*

*Tape and Reel

2

(1)

(1)

(1)

Z16-2 Industrial HEL15
Z16-2 Industrial HEL15
Z16-2 Industrial XEL15

(1)

Z16-2 Industrial XEL15