Micrel, Inc.
Precision Edge®
SY58021U
PACKAGE/ORDERING INFORMATION
16 15 14 13
IN 1
VT 2
VREF-AC 3
/IN 4
12 Q1
11 /Q1
10 Q2
9 /Q2
5678
16-Pin MLF™ (MLF-16)
Ordering Information(1)
Part Number
SY58021UMI
SY58021UMITR(2)
SY58021UMG
Package
Type
MLF-16
MLF-16
MLF-16
Operating
Range
Industrial
Industrial
Industrial
SY58021UMGTR(2) MLF-16 Industrial
Package
Marking
021U
021U
021U with
Pb-Free bar-line indicator
021U with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Pb-Free
NiPdAu
Pb-Free
NiPdAu
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only.
2. Tape and Reel.
PIN DESCRIPTION
Pin Number
1, 4
2
3
8, 13
5, 16
14, 15
11, 12
9, 10
6, 7
Pin Name
IN, /IN
VT
VREF-AC
VCC
GND,
Exposed Pad
/Q0, Q0,
/Q1, Q1,
/Q2, Q2,
/Q3, Q3
Pin Function
Differential Input: This input pair receives the signal to be buffered. Each pin of this pair
internally terminates with 50Ω to the VT pin. Note that this input will default to an
indeterminate state if left open. See “Input Interface Applications” section.
Input Termination Center-Tap: Each input terminates to this pin. The VT pin provides a
center-tap for each input (IN, /IN) to the termination network for maximum interface
flexibility. See “Input Interface Applications” section.
Reference Output Voltage: This output biases to VCC –1.2V. It is used when AC-coupling
to differential inputs. Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR
capacitor to VCC. See “Input Interface Applications” section.
Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the
VCC pins as possible.
Ground. Exposed pad must be connected to a ground plane that is the same potential as
the ground pin.
LVPECL Differential Output Pairs: Differential buffered output copy of the input signal. The
output swing is typically 800mV Proper termination is 50Ω to VCC–2V at the receiving end.
Unused output pairs may be left floating with no impact on jitter or skew.
See “LVPECL Output Termination” section.
M9999-062405
hbwhelp@micrel.com or (408) 955-1690
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