CY28408 Datasheet, PDF (18/18 Pages) Cypress Semiconductor – Clock Synthesizer with Differential CPU Outputs

CY28408
Table 12.Host Clock (HCSL) Buffer Characteristics
Characteristic
Ro
Ros
Vout
Minimum
3000 Ohms (recommended)
N/A
Maximum
N/A
1.2V
Iout is selectable depending on implementation. The param-
eters above apply to all configurations. Vout is the voltage at
the pin of the device.
The various output current configurations are shown in the
host swing select functions table. For all configurations, the
deviation from the expected output current is ±7% as shown in
the current accuracy table.
Table 13.CPU Clock Current Select Function
Mult0
0
1
Board Target Trace/Term Z
50 Ohms
50 Ohms
Reference R, Iref – Vdd (3*Rr)
Rr = 221 1%, Iref = 5.00mA
Rr = 475 1%, Iref = 2.32mA
Output Current
Ioh = 4*Iref
Ioh = 6*Iref
Voh @ Z
1.0V @ 50
0.7V @ 50
Ordering Information
Part Number
CY28408ZC
CY28408ZCT
Package Type
56-Pin TSSOP
56-Pin TSSOP - Tape and Reel
Product Flow
Commercial, 0q to 70qC
Commercial, 0q to 70qC
Package Drawings and Dimensions
56-Lead Thin Shrunk Small Outline Package, Type II (6 mm x 12 mm) Z56
0.249[0.009]
28
29
1
7.950[0.313]
8.255[0.325]
5.994[0.236]
6.198[0.244]
56
DIMENSIONS IN MM[INCHES] MIN.
REFERENCE JEDEC MO-153
PACKAGE WEIGHT 0.42gms
PART #
Z5624 STANDARD PKG.
ZZ5624 LEAD FREE PKG.
MAX.
13.894[0.547]
14.097[0.555]
1.100[0.043]
MAX.
GAUGE PLANE
0.25[0.010]
0.851[0.033]
0.950[0.037]
0.500[0.020]
BSC
0.170[0.006]
0.279[0.011]
0.051[0.002]
0.152[0.006]
0.20[0.008]
SEATING
PLANE
0° -8°
0.508[0.020]
0.762[0.030]
0.100[0.003]
0.200[0.008]
While SLI has reviewed all information herein for accuracy and reliability, Spectra Linear Inc. assumes no responsibility for the use of any cir-
cuitry or for the infringement of any patents or other rights of third parties which would result from each use. This product is intended for use in
normal commercial applications and is not warranted nor is it intended for use in life support, critical medical instruments, or any other applica-
tion requiring extended temperature range, high reliability, or any other extraordinary environmental requirements unless pursuant to additional
processing by Spectra Linear Inc., and expressed written agreement by Spectra Linear Inc. Spectra Linear Inc. reserves the right to change any
circuitry or specification without notice.
Rev 1.0, November 20, 2006
Page 18 of 18