sy58620l Micrel Semiconductor, sy58620l Datasheet - Page 4

• Manufacturer Part Number: sy58620l
• Description: Sy58620l Precision 4.25gbps Cml Backplane Transceiver With Integrated Loopback
• Manufacturer: Micrel Semiconductor

Pin Description
Inputs
January 2006
Micrel, Inc.
Pin Number
14, 13
1, 2
23
20
11
7
9
RXIN, /RXIN
LOOPBACK
TXIN, /TXIN
Pin Name
TXVCTRL
/RXEN
/TXEN
TXVT
Receiver Output Control. TTL/CMOS control input. /RXEN is an active LOW signal used to
enable the receiver outputs. /RXEN is internally connected to a 25kΩ pull-down resistor and will
default to a LOW state if left open. V
Pin Description
LOOPBACK Mode Control. TTL/CMOS control input. LOOPBACK is an active HIGH signal
used to control the LOOPBACK MUX. LOOPBACK is internally connected to a 25kΩ pull-
down resistor and will default to a LOW state if left open. V
Receiver Differential Input. Input accepts AC differential signals as small as 10mV (20mV
Each pin internally terminates to V
will default to an indeterminate state if RXIN inputs are left open. See figure 6b.
Transmitter Output Control. TTL/CMOS control input. /TXEN is an active LOW signal used to
enable the transmitter output. /TXEN is internally connected to a 25kΩ pull-down resistor and
will default to a LOW state if left open. V
Transmitter Differential Input. Input accepts AC- or DC-coupled differential signals as small as
100mV (200mV
indeterminate state if TXIN inputs are left open. See figure 6a.
Transmitter Output Swing Control. Input that controls the output amplitude of the transmitter.
The operating range of the control input is from V
Control of the output swing is obtained with a variable resistor between V
through a wiper driving TXVCTRL. Setting TXVCTRL to V
swing. Refer to the “Interface Applications” and “Output Stage” sections for more details.
Input Termination Center-Tap. Each side of the transmitter differential input pair terminates to
the TXVT pin. The TXVT pin provides a center-tap to a termination network for maximum
interface flexibility. Refer to the “Input Stage” section for more details.
PP
). Each pin terminates to the TXVT pin through 50Ω. Input will default to an
4
CC_RXIN
TH
= V
TH
-1.3V (internal voltage reference) through 50Ω. Input
CC
= V
/2.
CC
/2.
REF_CTRL
[e-mail]
(max swing) to V
CC_TXQ
TH
= V
sets the output swing to min
CC
/2.
REF_CTRL
CC
(min swing).
or [phone]
M9999-012006-C
and V
SY58620L
CC_TXQ
PP
).