83948I_16 Datasheet, PDF (1/13 Pages) Integrated Device Technology – Low Skew, 1-to-12 Differential-to- LVCMOS/LVTTL Fanout Buffer

Low Skew, 1-to-12 Differential-to-
LVCMOS/LVTTL Fanout Buffer
83948I
Datasheet
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES MAY 6, 2017
General Description
Features
The 83948I is a low skew, 1-to-12 Differential-to-LVCMOS/LVTTL
Fanout Buffer and a member of the family of High Performance
Clock Solutions from IDT. The 83948I has two selectable clock
inputs. The CLK, nCLK pair can accept most standard differential
input levels. The LVCMOS_CLK can accept LVCMOS or LVTTL
input levels. The low impedance LVCMOS/LVTTL outputs are
designed to drive 50 series or parallel terminated transmission
lines. The effective fanout can be increased from 12 to 24 by
utilizing the ability of the outputs to drive two series terminated
lines.
The 83948I is characterized at full 3.3V core/3.3V output.
Guaranteed output and part-to-part skew characteristics make the
83948I ideal for those clock distribution applications demanding
well defined performance and repeatability.
• Twelve LVCMOS/LVTTL outputs
• Selectable differential CLK/nCLK or LVCMOS/LVTTL clock
input
• CLK/nCLK pair can accept the following differential
input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL
• LVCMOS_CLK supports the following input types: LVCMOS,
LVTTL
• Maximum output frequency: 250MHz
• Output skew: 350ps (maximum)
• Part-to-part skew: 1.5ns (maximum)
• 3.3V core, 3.3V output
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package
• For drop in replacement part use 83948i-147
CLK_EN ^Pullup
LVCMOS_CLK ^Pullup
1
CLK ^Pullup
nCLK ^Pulldown
0
CLK_SEL ^Pullup
Block Diagram
D
Q
OE ^Pullup
©2016 Integrated Device Technology, Inc
Pin Assignment
32 31 30 29 28 27 26 25
Q0
CLK_SEL 1
LVCMOS_CLK 2
24 GND
23 Q4
Q1
CLK 3
22 VDDO
Q2
nCLK 4
CLK_EN 5
Q3
OE 6
Q4
VDD 7
21 ^Q5
20 GND
19 Q6
18 VDDO
Q5
GND 8
17 Q7
9 10 11 12 13 14 15 16
Q6
Q7
83948I
Q8
32-Lead LQFP
Q9
7mm x 7mm x 1.4mm package body
Q10
Y Package
Top View
Q11
1
May 19, 2016