HDMP-1526 Datasheet, PDF (9/14 Pages) Agilent(Hewlett-Packard) – Fibre Channel Transceiver Chip

I/O Type Definitions
I/O Type
I-TTL
O-TTL
HS_OUT
HS_IN
C
S
Definition
Input TTL. Floats High When Left Open.
Output TTL
High Speed Output. ECL Compatible
High Speed Input, Internally Biased, High Input Resistance
External Circuit Node
Power Supply or Ground
HDMP-1526 (TRx)
Pin Input Capacitance
Symbol
C_INPUT
Parameter
Pin Input Capacitance
Units
pF
Typ.
1.6
O_TTL
V_CC_TTL
I_TTL
V_CC_TTL
800
72
V_CC_TX
or
V_CC_RX
10 k
10 k
Max.
4.0
6k
36
GND_TTL
ESD
PROTECTION
GND
ESD
PROTECTION
GND_TTL
V_BB 1.4 V
Figure 9. O-TTL and I-TTL Simplified Circuit Schematic.
HS_OUT
60 µA 60 µA
ESD
PROTECTION
V_CC_TXHS
V_CC_TXECL
V_CC_RXHS
V_CC_TX
+DOUT
270
-DOUT
GND
270
V_CC_RX
75
0.01 µF
+DIN
Zo = 75 Ω
75 _{0.01 µF}
75
75
Zo = 75 Ω
0.01 µF
-DIN
GND
GND_TXHS
GND_RXHS
HS_IN
2V
+
–
3.2 K
+
–
2V
3.2 K
ESD
PROTECTION
Figure 10. HS_OUT and HS_IN Simplified Circuit Schematic.
Notes:
1. HS_IN inputs should never be connected to ground as permanent damage to the device may result.
2. 75 Ω serial padding resistors are optional, the serial resistors should be matched to the receiver input bias resistors.
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