ICS83940I-01 Datasheet, PDF (2/13 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-18 LVPECL-TO-LVCMOS / LVTTL FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS83940I-01
LOW SKEW, 1-TO-18
LVPECL-TO-LVCMOS / LVTTL FANOUT BUFFER
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 2, 12, 17, 25
GND
Power
Power supply ground.
3
LVCMOS_CLK
Input Pulldown Clock input. LVCMOS / LVTTL interface levels.
Clock select input. Selects LVCMOS / LVTTL clock
4
CLK_SEL
Input Pulldown input when HIGH. Selects PCLK, nPCLK inputs
when LOW. LVCMOS / LVTTL interface levels.
5
PCLK
Input Pulldown Non-inverting differential LVPECL clock input.
6
nPCLK
Input
7
8, 16, 21, 29
9, 10, 11, 13, 14,
15, 18, 19, 20, 22,
23, 24, 26, 27, 28,
30, 31, 32
V_DD
V_DDO
Q17, Q16, Q15, Q14, Q13,
Q12, Q11, Q10, Q9, Q8,
Q7, Q6, Q5, Q4, Q3,
Q2, Q1, Q0
Power
Power
Output
Inverting differential LVPECL clock input.
V_DD/2 default when left floating.
Core supply pins.
Output supply pins.
Clock outputs. LVCMOS / LVTTL interface levels.
NOTE: Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol Parameter
C_IN
C_PD
R
PULLDOWN
R_OUT
Input Capacitance
Power Dissipation Capacitance
(per output)
Input Pulldown Resistor
Output Impedance
Test Conditions
Minimum Typical Maximum Units
4
pF
6
pF
51
KΩ
18
28
Ω
TABLE 3A. CLOCK SELECT FUNCTION TABLE
Control Input
Clock
CLK_SEL
PCLK, nPCLK
LVCMOS_CLK
0
Selected
De-selected
1
De-selected
Selected
TABLE 3B. CLOCK INPUT FUNCTION TABLE
Inputs
CLK_SEL LVCMOS_CLK
PCLK
nPCLK
Outputs
Q0:Q17
Input to Output Mode
Polarity
0
—
0
1
LOW
Differential to Single Ended Non Inverting
0
—
1
0
HIGH
Differential to Single Ended Non Inverting
0
—
0
—
0
Biased;
NOTE 1
LOW
Single Ended to Single Ended Non Inverting
1
Biased;
NOTE 1
HIGH
Single Ended to Single Ended Non Inverting
0
—
Biased; NOTE 1
0
HIGH
Single Ended to Single Ended Inverting
0
—
Biased; NOTE 1
1
LOW
Single Ended to Single Ended Inverting
1
0
—
—
LOW
Single Ended to Single Ended Non Inverting
1
1
—
—
HIGH
Single Ended to Single Ended Non Inverting
NOTE 1: Please refer to the Application Information section, "Wiring the Differential Input to Accept Single Ended Levels".
83940DYI-01
www.icst.com/products/hiperclocks.html
REV. A MARCH 1, 2004
2