CY7C68000A CYPRESS [Cypress Semiconductor], CY7C68000A Datasheet - Page 7

• Manufacturer Part Number: CY7C68000A
• Manufacturer: CYPRESS [Cypress Semiconductor]

Document #: 38-08052 Rev. *F
Table 1. Pin Descriptions
QFN VFBGA
56
51
52
55
17
28
32
45
53
16
20
30
42
47
40
35
25
6
5
H3
H2
C6
C7
D7
C4
C5
C3
D1
D2
G6
C8
A7
A2
A3
E7
E8
F7
F2
ValidH
DataBus16_8
XTALIN
XTALOUT
Uni_Bidi
V
V
V
V
V
GND
GND
GND
GND
GND
Reserved
Reserved
Reserved
Reserved
CC
CC
CC
CC
CC
Name
[1]
(continued)
Ground
Ground
Ground
Ground
Ground
Output
INPUT
INPUT
INPUT
INPUT
Power
Power
Power
Power
Power
Type
Input
Input
Input
I/O
Default
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
ValidH This signal indicates that the high-order eight bits of a 16-bit data
word presented on the Data bus are valid. When DataBus16_8 = 1 and
TXValid = 0, ValidH is an output, indicating that the high-order receive
data byte on the Data bus is valid. When DataBus16_8 = 1 and TXValid
= 1, ValidH is an input and indicates that the high-order transmit data byte,
presented on the Data bus by the transceiver, is valid. When
DataBus16_8 = 0, ValidH is undefined. The status of the receive low-
order data byte is determined by RXValid and are present on D0–D7.
Data Bus 16_8 This signal selects between 8- and 16-bit data transfers.
1–16-bit data path operation enabled. CLK = 30 MHz.
0–8-bit data path operation enabled. When Uni_Bidi = 0, D[8:15] are un-
defined. When Uni_Bidi =1, D[0:7] are valid on TxValid and D[8:15] are
valid on RxValid. CLK = 60 MHz
Note: DataBus16_8 is static after Power-on Reset (POR) and is only
sampled at the end of Reset.
Crystal Input Connect this signal to a 24 MHz parallel-resonant, funda-
mental mode crystal and 20 pF capacitor to GND.
It is also correct to drive XTALIN with an external 24 MHz square wave
derived from another clock source.
Crystal Output Connect this signal to a 24 MHz parallel-resonant, funda-
mental mode crystal and 30 pF (nominal) capacitor to GND. If an external
clock is used to drive XTALIN, leave this pin open.
Driving this pin HIGH enables the unidirectional mode when the 8-
bit interface is selected. Uni_Bidi is static after power-on reset (POR).
V
V
V
V
V
Ground.
Ground.
Ground.
Ground.
Ground.
Connect pin to Ground.
Connect pin to Ground.
Connect pin to Ground.
Connect pin to Ground.
CC
CC
CC
CC
CC
. Connect to 3.3V power source.
. Connect to 3.3V power source.
. Connect to 3.3V power source.
. Connect to 3.3V power source.
. Connect to 3.3V power source.
Description
CY7C68000A
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