HDSP-420X Agilent(Hewlett-Packard), HDSP-420X Datasheet - Page 18

• Manufacturer Part Number: HDSP-420X
• Description: 20 mm (0.8 inch) Seven Segment Displays
• Manufacturer: Agilent(Hewlett-Packard)

HDMP-1514 (Rx), Signal Definitions (cont’d.)
N_RXTEMP
GND_TTLA
P_RXTEMP
GND_LOG
-LCK_REF
EN_CDET
GND_TTL
L_UNUSE
GND_HS
DR_REF
Symbol
EWRAP
GND_A
-EQEN
LOLB
LOLA
-POR
LIN
Loss of Light
Receiver Reference
Pin [21]
Enable Comma Detect
Pin [38]
Equalizer Enable Input Input
Pin [32]
Enable Wrap
Pin [71]
Analog Ground
Pins [3,4]
High Speed Ground
Pins [14,25,26]
Logic Ground
Pins[31,35,70,74]
TTL Ground
Pins [39,40,65,66]
TTL Ground
Pin [9]
Lock to Reference
Pin [36]
Link Unusable
Pin [73]
Local Serial Data
Pins [16,17]
Loss of Light
Signal
Pin [28]
Signal
Pin [29]
Temperature Monitor
Pin [6]
Temperature Monitor
Pin [8]
Power on Reset
Pin [27]
Signal Name
Output
Output
Output
Input
Input
Input
Input
Input
I/O
C
C
C
S
S
S
S
S
Logic Type
H50
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
This node is used to set the peak-to-peak signal level
of the loss of light detection circuitry.
When high, the receiver will reset internal clocks and
registers when an incoming comma character (K28.5)
of positive disparity (0011111xxx) is detected. When
low, clocks and registers will not reset and the comma
detect output is disabled. Comma detect is also disabled
whenever -LCK_REF is set low.
When set low, the internal cable equalizer amplifier on
the
When set high, the high speed data is taken from the
transmitter. When this input is set low, the high speed
input is taken from the
Normally 0 volts. Used to provide a clean ground plane
for the critical PLL and high speed analog cells.
Normally 0 volts.
Normally 0 volts. Used for all internal PECL logic.
Should be completely isolated from the noisy TTL
ground.
Normally 0 volts. Used for all TTL I/O buffer cells.
Normally 0 volts.
A low input causes the internal PLL to acquire
frequency lock on the external reference signal applied
at CLKIN. To assure lock, this pin should be held low
for at least 500 sec and held high at all other times. A
low input disables the comma detect function.
Typically supplied from open fiber control circuitry.
Used in conjunction with EWRAP and -LCK_REF to
keep the internal Vco near operational frequency,
optimizing frequency lock times.
High speed data port, typically connected to the
port on the local transmitter when in serial wrap mode.
A high signal on this pin indicates the amplitude of
the input serial data has fallen below a preset level
(see DR_REF) or no transitions have been detected
within 4 cycles of TBC.
A high signal on this pin indicates the amplitude of
the input serial data has fallen below a preset level
(see DR_REF) or no transitions have been detected
within 4 cycles of TBC.
Used in conjunction with pin 8 (P_RXTEMP) to
monitor the on-chip temperature diode (Cathode.)
Used in conjunction with pin 6 (N_RXTEMP) to
monitor the on-chip temperature diode (Anode.)
Active low output. Monitors the power supply voltage
on startup to assure V
LIN port, enabling the data input from the local
DI lines is enabled.
Description
CC
is at the proper DC level.
DI lines.
LOUT
673