DESCRIPTION
■475ps propagation delay
■2.8GHz toggle frequency
■Internal 75KΩ input pull-down resistors
■Available in 8-pin SOIC package
The SY10/100EL51 are differential clock D flip-flops
with reset. These devices are functionally similar to the
E151 devices, with higher performance capabilities. With
propagation delays and output transition times
significantly faster than the E151, the EL51 is ideally
suited for those applications which require the ultimate
in AC performance.
The reset input is an asynchronous, level triggered
signal. Data enters the master portion of the flip-flop
when the clock is LOW and is transferred to the slave,
and thus the outputs, upon a positive transition of the
clock. The differential clock inputs of the EL51 allow the
device to be used as a negative edge triggered flip-flop.
The differential input employs clamp circuitry to
maintain stability under open input (pulled down to VEE)
conditions.
FEATURES
DIFFERENTIAL
CLOCK D FLIP-FLOP
PIN CONFIGURATION/BLOCK DIAGRAM
PIN NAMES
Pin Function
R Reset Input
D Data Input
CLK Clock Input
Q Data Output
Rev.: E Amendment: /0
Issue Date: August, 1998
SY10EL51
SY100EL51
FINAL
1
2
3
45
6
7
8
RV
CC
Q
V
EE
D
Q
R
CLK Flip-Flop
D
CLK
SOIC
TOP VIEW
D R CLK Q
LLZL
HLZH
XHXL
NOTE:
1. Z = LOW-to-HIGH transition.
TRUTH TABLE(1)
1
2
SY10EL51
SY100EL51
Micrel
TA = –40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit
fMAX Maximum Toggle 1.8 2.8 — 2.2 2.8 — 2.2 2.8 — 2.2 2.8 — GHz
Frequency
tPLH Propagation Delay to ps
tPHL Output CLK 325 465 605 375 465 555 385 475 565 440 530 620
R 305 455 605 355 455 555 355 465 565 410 510 620
tSSet-up Time 150 0 — 150 0 — 150 0 — 150 0 — ps
tHHold Time 250 100 — 250 100 — 250 100 — 250 100 — ps
tRR Reset Recovery 400 200 — 400 200 — 400 200 — 400 200 — ps
tPW Minimum Pulse Width 400 — — 400 — — 400 — — 400 — — ps
CLK, Reset
VPP Minimum Input 150 — — 150 — — 150 — — 150 — — mV
Swing(1)
VCMR Common Mode (2) — –0.4 (2) — –0.4 (2) — –0.4 (2) — –0.4 V
Range(2)
trOutput Rise/Fall Times Q 100 225 350 100 225 350 100 225 350 100 225 350 ps
tf(20% to 80%)
AC ELECTRICAL CHARACTERISTICS
VEE = VEE (Min.) to VEE (Max.); VCC = GND
NOTES:
1. Minimum input swing for which AC parameters are guaranteed.
2. The CMR range is referenced to the most positive side of the differential input signal. Normal operation is obtained if the HIGH level falls within the specified
range and the peak-to-peak voltage lies between VPP min. and 1V. The lower end of the CMR range is dependent on VEE and is equal to VEE + 3.0V.
PRODUCT ORDERING CODE
Ordering Package Operating
Code Type Range
SY10EL51ZC Z8-1 Commercial
SY10EL51ZCTR Z8-1 Commercial
SY100EL51ZC Z8-1 Commercial
SY100EL51ZCTR Z8-1 Commercial
DC ELECTRICAL CHARACTERISTICS
TA = –40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit
IEE Power Supply Current mA
10EL — 24 29 19 24 29 19 24 29 19 24 29
100EL — 24 29 19 24 29 19 24 29 24 30 36
VEE Power Supply Voltage V
10EL –4.75 –5.2 –5.5 –4.75 –5.2 –5.5 –4.75 –5.2 –5.5 –4.75 –5.2 –5.5
100EL –4.20 –4.5 –5.5 –4.20 –4.5 –5.5 –4.20 –4.5 –5.5 –4.20 –4.5 –5.5
IIH Input HIGH Current — — 150 — — 150 — — 150 — — 150 µA
VEE = VEE (Min.) to VEE (Max.); VCC = GND
3
SY10EL51
SY100EL51
Micrel
8 LEAD SOIC .150" WIDE (Z8-1)
Rev. 03
4
SY10EL51
SY100EL51
Micrel
MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA
TEL + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
