Datasheet

CY8C21634, CY8C21534, CY8C21434
CY8C21334, CY8C21234
Document Number: 38-12025 Rev. AB Page 14 of 53
20 I/O P3[1]
21 NC No connection. Pin must be left floating
22 NC No connection. Pin must be left floating
23 I/O P1[7] I
2
C SCL
24 I/O P1[5] I
2
C SDA
25 NC No connection. Pin must be left floating
26 I/O P1[3] I
FMTEST
27 I/O P1[1] I
2
C SCL, ISSP-SCLK
[14]
28 Power V
SS
Ground connection
29 NC No connection. Pin must be left floating
30 NC No connection. Pin must be left floating
31 I/O P1[0] I
2
C SDA, ISSP-SDATA
[14]
32 I/O P1[2] V
FMTEST
33 I/O P1[4] Optional external clock input (EXTCLK)
34 I/O P1[6]
35 NC No connection. Pin must be left floating
36 NC No connection. Pin must be left floating
37 NC No connection. Pin must be left floating
38 NC No connection. Pin must be left floating
39 NC No connection. Pin must be left floating
40 NC No connection. Pin must be left floating
41 Input XRES Active high external reset with internal pull-down
42 OCD HCLK OCD high-speed clock output
43 OCD CCLK OCD CPU clock output
44 I/O P3[0]
45 I/O P3[2]
46 NC No connection. Pin must be left floating
47 NC No connection. Pin must be left floating
48 I/O IP2[0]
49 I/O IP2[2]
50 I/O P2[4]
51 I/O P2[6]
52 I/O I P0[0] Analog column mux input
53 I/O I P0[2] Analog column mux input and column output
54 I/O I P0[4] Analog column mux input and column output
55 I/O I P0[6] Analog column mux input
56 Power V
DD
Supply voltage
LEGEND: A = Analog, I = Input, O = Output, and OCD = On-Chip Debug.
Pin Definitions (continued)
CY8C21001 56-pin SSOP
Pin No.
Type
Pin Name Description
Digital Analog
Note
14. These are the ISSP pins, which are not High Z at POR. See the PSoC Technical Reference Manual for details.